Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 907 insertions, 0 deletions

diff --git a/dom/base/nsContentSink.cpp b/dom/base/nsContentSink.cpp
new file mode 100644
index 0000000000..5cd2c1303f
--- /dev/null
+++ b/dom/base/nsContentSink.cpp
@@ -0,0 +1,907 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Base class for the XML and HTML content sinks, which construct a
+ * DOM based on information from the parser.
+ */
+
+#include "nsContentSink.h"
+#include "mozilla/Components.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/StaticPrefs_browser.h"
+#include "mozilla/StaticPrefs_content.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/LinkStyle.h"
+#include "mozilla/dom/ReferrerInfo.h"
+#include "mozilla/css/Loader.h"
+#include "mozilla/dom/MutationObservers.h"
+#include "mozilla/dom/SRILogHelper.h"
+#include "mozilla/StoragePrincipalHelper.h"
+#include "mozilla/net/HttpBaseChannel.h"
+#include "mozilla/net/NeckoChannelParams.h"
+#include "nsIDocShell.h"
+#include "nsILoadContext.h"
+#include "nsIPrefetchService.h"
+#include "nsIURI.h"
+#include "nsNetUtil.h"
+#include "nsIMIMEHeaderParam.h"
+#include "nsIProtocolHandler.h"
+#include "nsIHttpChannel.h"
+#include "nsIContent.h"
+#include "nsPresContext.h"
+#include "nsViewManager.h"
+#include "nsAtom.h"
+#include "nsGkAtoms.h"
+#include "nsGlobalWindowInner.h"
+#include "nsNetCID.h"
+#include "nsICookieService.h"
+#include "nsContentUtils.h"
+#include "nsNodeInfoManager.h"
+#include "nsIAppShell.h"
+#include "nsIWidget.h"
+#include "nsWidgetsCID.h"
+#include "mozAutoDocUpdate.h"
+#include "nsIWebNavigation.h"
+#include "nsGenericHTMLElement.h"
+#include "nsIObserverService.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/dom/HTMLDNSPrefetch.h"
+#include "mozilla/dom/ServiceWorkerDescriptor.h"
+#include "mozilla/dom/ScriptLoader.h"
+#include "nsParserConstants.h"
+#include "nsSandboxFlags.h"
+#include "Link.h"
+#include "HTMLLinkElement.h"
+using namespace mozilla;
+using namespace mozilla::css;
+using namespace mozilla::dom;
+
+LazyLogModule gContentSinkLogModuleInfo("nscontentsink");
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsContentSink)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsContentSink)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsContentSink)
+  NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
+  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+  NS_INTERFACE_MAP_ENTRY(nsIDocumentObserver)
+  NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
+  NS_INTERFACE_MAP_ENTRY(nsITimerCallback)
+  NS_INTERFACE_MAP_ENTRY(nsINamed)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDocumentObserver)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsContentSink)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsContentSink)
+  if (tmp->mDocument) {
+    tmp->mDocument->RemoveObserver(tmp);
+  }
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParser)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocShell)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mCSSLoader)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mNodeInfoManager)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mScriptLoader)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsContentSink)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParser)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocShell)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCSSLoader)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNodeInfoManager)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mScriptLoader)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+nsContentSink::nsContentSink()
+    : mBackoffCount(0),
+      mLastNotificationTime(0),
+      mLayoutStarted(0),
+      mDynamicLowerValue(0),
+      mParsing(0),
+      mDroppedTimer(0),
+      mDeferredLayoutStart(0),
+      mDeferredFlushTags(0),
+      mIsDocumentObserver(0),
+      mRunsToCompletion(0),
+      mIsBlockingOnload(false),
+      mDeflectedCount(0),
+      mHasPendingEvent(false),
+      mCurrentParseEndTime(0),
+      mBeginLoadTime(0),
+      mLastSampledUserEventTime(0),
+      mInMonolithicContainer(0),
+      mInNotification(0),
+      mUpdatesInNotification(0),
+      mPendingSheetCount(0) {
+  NS_ASSERTION(!mLayoutStarted, "What?");
+  NS_ASSERTION(!mDynamicLowerValue, "What?");
+  NS_ASSERTION(!mParsing, "What?");
+  NS_ASSERTION(mLastSampledUserEventTime == 0, "What?");
+  NS_ASSERTION(mDeflectedCount == 0, "What?");
+  NS_ASSERTION(!mDroppedTimer, "What?");
+  NS_ASSERTION(mInMonolithicContainer == 0, "What?");
+  NS_ASSERTION(mInNotification == 0, "What?");
+  NS_ASSERTION(!mDeferredLayoutStart, "What?");
+}
+
+nsContentSink::~nsContentSink() {
+  if (mDocument) {
+    // Remove ourselves just to be safe, though we really should have
+    // been removed in DidBuildModel if everything worked right.
+    mDocument->RemoveObserver(this);
+  }
+}
+
+nsresult nsContentSink::Init(Document* aDoc, nsIURI* aURI,
+                             nsISupports* aContainer, nsIChannel* aChannel) {
+  MOZ_ASSERT(aDoc, "null ptr");
+  MOZ_ASSERT(aURI, "null ptr");
+
+  if (!aDoc || !aURI) {
+    return NS_ERROR_NULL_POINTER;
+  }
+
+  mDocument = aDoc;
+
+  mDocumentURI = aURI;
+  mDocShell = do_QueryInterface(aContainer);
+  mScriptLoader = mDocument->ScriptLoader();
+
+  if (!mRunsToCompletion) {
+    if (mDocShell) {
+      uint32_t loadType = 0;
+      mDocShell->GetLoadType(&loadType);
+      mDocument->SetChangeScrollPosWhenScrollingToRef(
+          (loadType & nsIDocShell::LOAD_CMD_HISTORY) == 0);
+    }
+
+    ProcessHTTPHeaders(aChannel);
+  }
+
+  mCSSLoader = aDoc->CSSLoader();
+
+  mNodeInfoManager = aDoc->NodeInfoManager();
+
+  mBackoffCount = StaticPrefs::content_notify_backoffcount();
+
+  if (StaticPrefs::content_sink_enable_perf_mode() != 0) {
+    mDynamicLowerValue = StaticPrefs::content_sink_enable_perf_mode() == 1;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsContentSink::StyleSheetLoaded(StyleSheet* aSheet, bool aWasDeferred,
+                                nsresult aStatus) {
+  MOZ_ASSERT(!mRunsToCompletion, "How come a fragment parser observed sheets?");
+  if (aWasDeferred) {
+    return NS_OK;
+  }
+  MOZ_ASSERT(mPendingSheetCount > 0, "How'd that happen?");
+  --mPendingSheetCount;
+
+  const bool loadedAllSheets = !mPendingSheetCount;
+  if (loadedAllSheets && (mDeferredLayoutStart || mDeferredFlushTags)) {
+    if (mDeferredFlushTags) {
+      FlushTags();
+    }
+    if (mDeferredLayoutStart) {
+      // We might not have really started layout, since this sheet was still
+      // loading.  Do it now.  Probably doesn't matter whether we do this
+      // before or after we unblock scripts, but before feels saner.  Note
+      // that if mDeferredLayoutStart is true, that means any subclass
+      // StartLayout() stuff that needs to happen has already happened, so
+      // we don't need to worry about it.
+      StartLayout(false);
+    }
+
+    // Go ahead and try to scroll to our ref if we have one
+    ScrollToRef();
+  }
+
+  mScriptLoader->RemoveParserBlockingScriptExecutionBlocker();
+
+  if (loadedAllSheets &&
+      mDocument->GetReadyStateEnum() >= Document::READYSTATE_INTERACTIVE) {
+    mScriptLoader->DeferCheckpointReached();
+  }
+
+  return NS_OK;
+}
+
+nsresult nsContentSink::ProcessHTTPHeaders(nsIChannel* aChannel) {
+  nsCOMPtr<nsIHttpChannel> httpchannel(do_QueryInterface(aChannel));
+
+  if (!httpchannel) {
+    return NS_OK;
+  }
+
+  bool gotEarlyHints = false;
+  if (nsCOMPtr<mozilla::net::HttpBaseChannel> baseChannel =
+          do_QueryInterface(aChannel)) {
+    nsTArray<mozilla::net::EarlyHintConnectArgs> earlyHints =
+        baseChannel->TakeEarlyHints();
+    gotEarlyHints = !earlyHints.IsEmpty();
+    mDocument->SetEarlyHints(std::move(earlyHints));
+  }
+
+  // Note that the only header we care about is the "link" header, since we
+  // have all the infrastructure for kicking off stylesheet loads.
+
+  nsAutoCString linkHeader;
+
+  nsresult rv = httpchannel->GetResponseHeader("link"_ns, linkHeader);
+  bool gotLinkHeader = NS_SUCCEEDED(rv) && !linkHeader.IsEmpty();
+  if (gotLinkHeader) {
+    mDocument->SetHeaderData(nsGkAtoms::link,
+                             NS_ConvertASCIItoUTF16(linkHeader));
+  }
+  if (gotLinkHeader || gotEarlyHints) {
+    NS_ASSERTION(!mProcessLinkHeaderEvent.get(),
+                 "Already dispatched an event?");
+
+    mProcessLinkHeaderEvent =
+        NewNonOwningRunnableMethod("nsContentSink::DoProcessLinkHeader", this,
+                                   &nsContentSink::DoProcessLinkHeader);
+    rv = NS_DispatchToCurrentThread(mProcessLinkHeaderEvent.get());
+    if (NS_FAILED(rv)) {
+      mProcessLinkHeaderEvent.Forget();
+    }
+  }
+
+  return NS_OK;
+}
+
+void nsContentSink::DoProcessLinkHeader() {
+  for (const auto& earlyHint : mDocument->GetEarlyHints()) {
+    ProcessLinkFromHeader(earlyHint.link(), earlyHint.earlyHintPreloaderId());
+  }
+
+  nsAutoString value;
+  mDocument->GetHeaderData(nsGkAtoms::link, value);
+  auto linkHeaders = net::ParseLinkHeader(value);
+  for (const auto& linkHeader : linkHeaders) {
+    ProcessLinkFromHeader(linkHeader, 0);
+  }
+}
+
+nsresult nsContentSink::ProcessLinkFromHeader(const net::LinkHeader& aHeader,
+                                              uint64_t aEarlyHintPreloaderId) {
+  uint32_t linkTypes = LinkStyle::ParseLinkTypes(aHeader.mRel);
+
+  // The link relation may apply to a different resource, specified
+  // in the anchor parameter. For the link relations supported so far,
+  // we simply abort if the link applies to a resource different to the
+  // one we've loaded
+  if (!nsContentUtils::LinkContextIsURI(aHeader.mAnchor,
+                                        mDocument->GetDocumentURI())) {
+    return NS_OK;
+  }
+
+  if (nsContentUtils::PrefetchPreloadEnabled(mDocShell)) {
+    // prefetch href if relation is "next" or "prefetch"
+    if ((linkTypes & LinkStyle::eNEXT) || (linkTypes & LinkStyle::ePREFETCH)) {
+      PrefetchHref(aHeader.mHref, aHeader.mAs, aHeader.mType, aHeader.mMedia);
+    }
+
+    if (!aHeader.mHref.IsEmpty() && (linkTypes & LinkStyle::eDNS_PREFETCH)) {
+      PrefetchDNS(aHeader.mHref);
+    }
+
+    if (!aHeader.mHref.IsEmpty() && (linkTypes & LinkStyle::ePRECONNECT)) {
+      Preconnect(aHeader.mHref, aHeader.mCrossOrigin);
+    }
+
+    if (linkTypes & LinkStyle::ePRELOAD) {
+      PreloadHref(aHeader.mHref, aHeader.mAs, aHeader.mType, aHeader.mMedia,
+                  aHeader.mIntegrity, aHeader.mSrcset, aHeader.mSizes,
+                  aHeader.mCrossOrigin, aHeader.mReferrerPolicy,
+                  aEarlyHintPreloaderId);
+    }
+
+    if ((linkTypes & LinkStyle::eMODULE_PRELOAD) &&
+        mDocument->ScriptLoader()->GetModuleLoader()) {
+      // https://html.spec.whatwg.org/multipage/webappapis.html#fetch-a-modulepreload-module-script-graph
+      // Step 1. Disallow further import maps given settings object.
+      mDocument->ScriptLoader()->GetModuleLoader()->DisallowImportMaps();
+    }
+  }
+
+  // is it a stylesheet link?
+  if (!(linkTypes & LinkStyle::eSTYLESHEET)) {
+    return NS_OK;
+  }
+
+  bool isAlternate = linkTypes & LinkStyle::eALTERNATE;
+  return ProcessStyleLinkFromHeader(aHeader.mHref, isAlternate, aHeader.mTitle,
+                                    aHeader.mIntegrity, aHeader.mType,
+                                    aHeader.mMedia, aHeader.mReferrerPolicy);
+}
+
+nsresult nsContentSink::ProcessStyleLinkFromHeader(
+    const nsAString& aHref, bool aAlternate, const nsAString& aTitle,
+    const nsAString& aIntegrity, const nsAString& aType,
+    const nsAString& aMedia, const nsAString& aReferrerPolicy) {
+  if (aAlternate && aTitle.IsEmpty()) {
+    // alternates must have title return without error, for now
+    return NS_OK;
+  }
+
+  nsAutoString mimeType;
+  nsAutoString params;
+  nsContentUtils::SplitMimeType(aType, mimeType, params);
+
+  // see bug 18817
+  if (!mimeType.IsEmpty() && !mimeType.LowerCaseEqualsLiteral("text/css")) {
+    // Unknown stylesheet language
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIURI> url;
+  nsresult rv = NS_NewURI(getter_AddRefs(url), aHref, nullptr,
+                          mDocument->GetDocBaseURI());
+
+  if (NS_FAILED(rv)) {
+    // The URI is bad, move along, don't propagate the error (for now)
+    return NS_OK;
+  }
+
+  // Link header is working like a <link> node, so referrerPolicy attr should
+  // have higher priority than referrer policy from document.
+  ReferrerPolicy policy =
+      ReferrerInfo::ReferrerPolicyAttributeFromString(aReferrerPolicy);
+  nsCOMPtr<nsIReferrerInfo> referrerInfo =
+      ReferrerInfo::CreateFromDocumentAndPolicyOverride(mDocument, policy);
+
+  Loader::SheetInfo info{
+      *mDocument,
+      nullptr,
+      url.forget(),
+      nullptr,
+      referrerInfo.forget(),
+      CORS_NONE,
+      aTitle,
+      aMedia,
+      aIntegrity,
+      /* nonce = */ u""_ns,
+      aAlternate ? Loader::HasAlternateRel::Yes : Loader::HasAlternateRel::No,
+      Loader::IsInline::No,
+      Loader::IsExplicitlyEnabled::No,
+  };
+
+  auto loadResultOrErr =
+      mCSSLoader->LoadStyleLink(info, mRunsToCompletion ? nullptr : this);
+  if (loadResultOrErr.isErr()) {
+    return loadResultOrErr.unwrapErr();
+  }
+
+  if (loadResultOrErr.inspect().ShouldBlock() && !mRunsToCompletion) {
+    ++mPendingSheetCount;
+    mScriptLoader->AddParserBlockingScriptExecutionBlocker();
+  }
+
+  return NS_OK;
+}
+
+void nsContentSink::PrefetchHref(const nsAString& aHref, const nsAString& aAs,
+                                 const nsAString& aType,
+                                 const nsAString& aMedia) {
+  nsCOMPtr<nsIPrefetchService> prefetchService(components::Prefetch::Service());
+  if (prefetchService) {
+    // construct URI using document charset
+    auto encoding = mDocument->GetDocumentCharacterSet();
+    nsCOMPtr<nsIURI> uri;
+    NS_NewURI(getter_AddRefs(uri), aHref, encoding, mDocument->GetDocBaseURI());
+    if (uri) {
+      auto referrerInfo = MakeRefPtr<ReferrerInfo>(*mDocument);
+      referrerInfo = referrerInfo->CloneWithNewOriginalReferrer(mDocumentURI);
+
+      prefetchService->PrefetchURI(uri, referrerInfo, mDocument, true);
+    }
+  }
+}
+
+void nsContentSink::PreloadHref(const nsAString& aHref, const nsAString& aAs,
+                                const nsAString& aType, const nsAString& aMedia,
+                                const nsAString& aIntegrity,
+                                const nsAString& aSrcset,
+                                const nsAString& aSizes, const nsAString& aCORS,
+                                const nsAString& aReferrerPolicy,
+                                uint64_t aEarlyHintPreloaderId) {
+  auto encoding = mDocument->GetDocumentCharacterSet();
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), aHref, encoding, mDocument->GetDocBaseURI());
+  if (!uri) {
+    // URL parsing failed.
+    return;
+  }
+
+  nsAttrValue asAttr;
+  mozilla::net::ParseAsValue(aAs, asAttr);
+
+  nsAutoString mimeType;
+  nsAutoString notUsed;
+  nsContentUtils::SplitMimeType(aType, mimeType, notUsed);
+
+  auto policyType = mozilla::net::AsValueToContentPolicy(asAttr);
+  if (policyType == nsIContentPolicy::TYPE_INVALID ||
+      !mozilla::net::CheckPreloadAttrs(asAttr, mimeType, aMedia, mDocument)) {
+    // Ignore preload wrong or empty attributes.
+    mozilla::net::WarnIgnoredPreload(*mDocument, *uri);
+    return;
+  }
+
+  mDocument->Preloads().PreloadLinkHeader(
+      uri, aHref, policyType, aAs, aType, aIntegrity, aSrcset, aSizes, aCORS,
+      aReferrerPolicy, aEarlyHintPreloaderId);
+}
+
+void nsContentSink::PrefetchDNS(const nsAString& aHref) {
+  nsAutoString hostname;
+  bool isHttps = false;
+
+  if (StringBeginsWith(aHref, u"//"_ns)) {
+    hostname = Substring(aHref, 2);
+  } else {
+    nsCOMPtr<nsIURI> uri;
+    NS_NewURI(getter_AddRefs(uri), aHref);
+    if (!uri) {
+      return;
+    }
+    nsresult rv;
+    bool isLocalResource = false;
+    rv = NS_URIChainHasFlags(uri, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
+                             &isLocalResource);
+    if (NS_SUCCEEDED(rv) && !isLocalResource) {
+      nsAutoCString host;
+      uri->GetHost(host);
+      CopyUTF8toUTF16(host, hostname);
+    }
+    isHttps = uri->SchemeIs("https");
+  }
+
+  if (!hostname.IsEmpty() && HTMLDNSPrefetch::IsAllowed(mDocument)) {
+    OriginAttributes oa;
+    StoragePrincipalHelper::GetOriginAttributesForNetworkState(mDocument, oa);
+
+    HTMLDNSPrefetch::Prefetch(hostname, isHttps, oa,
+                              mDocument->GetChannel()->GetTRRMode(),
+                              HTMLDNSPrefetch::Priority::Low);
+  }
+}
+
+void nsContentSink::Preconnect(const nsAString& aHref,
+                               const nsAString& aCrossOrigin) {
+  // construct URI using document charset
+  auto encoding = mDocument->GetDocumentCharacterSet();
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), aHref, encoding, mDocument->GetDocBaseURI());
+
+  if (uri && mDocument) {
+    mDocument->MaybePreconnect(uri,
+                               dom::Element::StringToCORSMode(aCrossOrigin));
+  }
+}
+
+void nsContentSink::ScrollToRef() {
+  RefPtr<Document> document = mDocument;
+  document->ScrollToRef();
+}
+
+void nsContentSink::StartLayout(bool aIgnorePendingSheets) {
+  if (mLayoutStarted) {
+    // Nothing to do here
+    return;
+  }
+
+  mDeferredLayoutStart = true;
+
+  if (!aIgnorePendingSheets &&
+      (WaitForPendingSheets() || mDocument->HasPendingInitialTranslation())) {
+    // Bail out; we'll start layout when the sheets and l10n load
+    return;
+  }
+
+  AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING_RELEVANT_FOR_JS(
+      "Layout", LAYOUT, mDocumentURI->GetSpecOrDefault());
+
+  mDeferredLayoutStart = false;
+
+  if (aIgnorePendingSheets) {
+    nsContentUtils::ReportToConsole(
+        nsIScriptError::warningFlag, "Layout"_ns, mDocument,
+        nsContentUtils::eLAYOUT_PROPERTIES, "ForcedLayoutStart");
+  }
+
+  // Notify on all our content.  If none of our presshells have started layout
+  // yet it'll be a no-op except for updating our data structures, a la
+  // UpdateChildCounts() (because we don't want to double-notify on whatever we
+  // have right now).  If some of them _have_ started layout, we want to make
+  // sure to flush tags instead of just calling UpdateChildCounts() after we
+  // loop over the shells.
+  FlushTags();
+
+  mLayoutStarted = true;
+  mLastNotificationTime = PR_Now();
+
+  mDocument->SetMayStartLayout(true);
+  RefPtr<PresShell> presShell = mDocument->GetPresShell();
+  // Make sure we don't call Initialize() for a shell that has
+  // already called it. This can happen when the layout frame for
+  // an iframe is constructed *between* the Embed() call for the
+  // docshell in the iframe, and the content sink's call to OpenBody().
+  // (Bug 153815)
+  if (presShell && !presShell->DidInitialize()) {
+    nsresult rv = presShell->Initialize();
+    if (NS_FAILED(rv)) {
+      return;
+    }
+  }
+
+  // If the document we are loading has a reference or it is a
+  // frameset document, disable the scroll bars on the views.
+
+  mDocument->SetScrollToRef(mDocument->GetDocumentURI());
+}
+
+void nsContentSink::NotifyAppend(nsIContent* aContainer, uint32_t aStartIndex) {
+  mInNotification++;
+
+  {
+    // Scope so we call EndUpdate before we decrease mInNotification
+    //
+    // Note that aContainer->OwnerDoc() may not be mDocument.
+    MOZ_AUTO_DOC_UPDATE(aContainer->OwnerDoc(), true);
+    MutationObservers::NotifyContentAppended(
+        aContainer, aContainer->GetChildAt_Deprecated(aStartIndex));
+    mLastNotificationTime = PR_Now();
+  }
+
+  mInNotification--;
+}
+
+NS_IMETHODIMP
+nsContentSink::Notify(nsITimer* timer) {
+  if (mParsing) {
+    // We shouldn't interfere with our normal DidProcessAToken logic
+    mDroppedTimer = true;
+    return NS_OK;
+  }
+
+  if (WaitForPendingSheets()) {
+    mDeferredFlushTags = true;
+  } else {
+    FlushTags();
+
+    // Now try and scroll to the reference
+    // XXX Should we scroll unconditionally for history loads??
+    ScrollToRef();
+  }
+
+  mNotificationTimer = nullptr;
+  return NS_OK;
+}
+
+bool nsContentSink::IsTimeToNotify() {
+  if (!StaticPrefs::content_notify_ontimer() || !mLayoutStarted ||
+      !mBackoffCount || mInMonolithicContainer) {
+    return false;
+  }
+
+  if (WaitForPendingSheets()) {
+    mDeferredFlushTags = true;
+    return false;
+  }
+
+  PRTime now = PR_Now();
+
+  int64_t interval = GetNotificationInterval();
+  int64_t diff = now - mLastNotificationTime;
+
+  if (diff > interval) {
+    mBackoffCount--;
+    return true;
+  }
+
+  return false;
+}
+
+nsresult nsContentSink::WillInterruptImpl() {
+  nsresult result = NS_OK;
+
+  SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
+             SINK_TRACE_CALLS, ("nsContentSink::WillInterrupt: this=%p", this));
+#ifndef SINK_NO_INCREMENTAL
+  if (WaitForPendingSheets()) {
+    mDeferredFlushTags = true;
+  } else if (StaticPrefs::content_notify_ontimer() && mLayoutStarted) {
+    if (mBackoffCount && !mInMonolithicContainer) {
+      int64_t now = PR_Now();
+      int64_t interval = GetNotificationInterval();
+      int64_t diff = now - mLastNotificationTime;
+
+      // If it's already time for us to have a notification
+      if (diff > interval || mDroppedTimer) {
+        mBackoffCount--;
+        SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
+                   SINK_TRACE_REFLOW,
+                   ("nsContentSink::WillInterrupt: flushing tags since we've "
+                    "run out time; backoff count: %d",
+                    mBackoffCount));
+        result = FlushTags();
+        if (mDroppedTimer) {
+          ScrollToRef();
+          mDroppedTimer = false;
+        }
+      } else if (!mNotificationTimer) {
+        interval -= diff;
+        int32_t delay = interval;
+
+        // Convert to milliseconds
+        delay /= PR_USEC_PER_MSEC;
+
+        NS_NewTimerWithCallback(getter_AddRefs(mNotificationTimer), this, delay,
+                                nsITimer::TYPE_ONE_SHOT);
+        if (mNotificationTimer) {
+          SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
+                     SINK_TRACE_REFLOW,
+                     ("nsContentSink::WillInterrupt: setting up timer with "
+                      "delay %d",
+                      delay));
+        }
+      }
+    }
+  } else {
+    SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
+               SINK_TRACE_REFLOW,
+               ("nsContentSink::WillInterrupt: flushing tags "
+                "unconditionally"));
+    result = FlushTags();
+  }
+#endif
+
+  mParsing = false;
+
+  return result;
+}
+
+void nsContentSink::WillResumeImpl() {
+  SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
+             SINK_TRACE_CALLS, ("nsContentSink::WillResume: this=%p", this));
+
+  mParsing = true;
+}
+
+nsresult nsContentSink::DidProcessATokenImpl() {
+  if (mRunsToCompletion || !mParser) {
+    return NS_OK;
+  }
+
+  // Get the current user event time
+  PresShell* presShell = mDocument->GetPresShell();
+  if (!presShell) {
+    // If there's no pres shell in the document, return early since
+    // we're not laying anything out here.
+    return NS_OK;
+  }
+
+  // Increase before comparing to gEventProbeRate
+  ++mDeflectedCount;
+
+  // Check if there's a pending event
+  if (StaticPrefs::content_sink_pending_event_mode() != 0 &&
+      !mHasPendingEvent &&
+      (mDeflectedCount % StaticPrefs::content_sink_event_probe_rate()) == 0) {
+    nsViewManager* vm = presShell->GetViewManager();
+    NS_ENSURE_TRUE(vm, NS_ERROR_FAILURE);
+    nsCOMPtr<nsIWidget> widget = vm->GetRootWidget();
+    mHasPendingEvent = widget && widget->HasPendingInputEvent();
+  }
+
+  if (mHasPendingEvent && StaticPrefs::content_sink_pending_event_mode() == 2) {
+    return NS_ERROR_HTMLPARSER_INTERRUPTED;
+  }
+
+  // Have we processed enough tokens to check time?
+  if (!mHasPendingEvent &&
+      mDeflectedCount <
+          uint32_t(mDynamicLowerValue
+                       ? StaticPrefs::content_sink_interactive_deflect_count()
+                       : StaticPrefs::content_sink_perf_deflect_count())) {
+    return NS_OK;
+  }
+
+  mDeflectedCount = 0;
+
+  // Check if it's time to return to the main event loop
+  if (PR_IntervalToMicroseconds(PR_IntervalNow()) > mCurrentParseEndTime) {
+    return NS_ERROR_HTMLPARSER_INTERRUPTED;
+  }
+
+  return NS_OK;
+}
+
+//----------------------------------------------------------------------
+
+void nsContentSink::BeginUpdate(Document* aDocument) {
+  // Remember nested updates from updates that we started.
+  if (mInNotification > 0 && mUpdatesInNotification < 2) {
+    ++mUpdatesInNotification;
+  }
+
+  // If we're in a script and we didn't do the notification,
+  // something else in the script processing caused the
+  // notification to occur. Since this could result in frame
+  // creation, make sure we've flushed everything before we
+  // continue.
+
+  if (!mInNotification++) {
+    FlushTags();
+  }
+}
+
+void nsContentSink::EndUpdate(Document* aDocument) {
+  // If we're in a script and we didn't do the notification,
+  // something else in the script processing caused the
+  // notification to occur. Update our notion of how much
+  // has been flushed to include any new content if ending
+  // this update leaves us not inside a notification.
+  if (!--mInNotification) {
+    UpdateChildCounts();
+  }
+}
+
+void nsContentSink::DidBuildModelImpl(bool aTerminated) {
+  MOZ_ASSERT(aTerminated ||
+                 mDocument->GetReadyStateEnum() == Document::READYSTATE_LOADING,
+             "Bad readyState");
+  mDocument->SetReadyStateInternal(Document::READYSTATE_INTERACTIVE);
+
+  if (mScriptLoader) {
+    mScriptLoader->ParsingComplete(aTerminated);
+    if (!mPendingSheetCount) {
+      mScriptLoader->DeferCheckpointReached();
+    }
+  }
+
+  if (!mDocument->HaveFiredDOMTitleChange()) {
+    mDocument->NotifyPossibleTitleChange(false);
+  }
+
+  // Cancel a timer if we had one out there
+  if (mNotificationTimer) {
+    SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
+               SINK_TRACE_REFLOW,
+               ("nsContentSink::DidBuildModel: canceling notification "
+                "timeout"));
+    mNotificationTimer->Cancel();
+    mNotificationTimer = nullptr;
+  }
+}
+
+void nsContentSink::DropParserAndPerfHint(void) {
+  if (!mParser) {
+    // Make sure we don't unblock unload too many times
+    return;
+  }
+
+  // Ref. Bug 49115
+  // Do this hack to make sure that the parser
+  // doesn't get destroyed, accidently, before
+  // the circularity, between sink & parser, is
+  // actually broken.
+  // Drop our reference to the parser to get rid of a circular
+  // reference.
+  RefPtr<nsParserBase> kungFuDeathGrip = std::move(mParser);
+  mozilla::Unused << kungFuDeathGrip;
+
+  // Call UnblockOnload only if mRunsToComletion is false and if
+  // we have already started loading because it's possible that this function
+  // is called (i.e. the parser is terminated) before we start loading due to
+  // destroying the window inside unload event callbacks for the previous
+  // document.
+  if (!mRunsToCompletion && mIsBlockingOnload) {
+    mDocument->UnblockOnload(true);
+    mIsBlockingOnload = false;
+  }
+}
+
+bool nsContentSink::IsScriptExecutingImpl() {
+  return !!mScriptLoader->GetCurrentScript();
+}
+
+nsresult nsContentSink::WillParseImpl(void) {
+  if (mRunsToCompletion || !mDocument) {
+    return NS_OK;
+  }
+
+  PresShell* presShell = mDocument->GetPresShell();
+  if (!presShell) {
+    return NS_OK;
+  }
+
+  uint32_t currentTime = PR_IntervalToMicroseconds(PR_IntervalNow());
+
+  if (StaticPrefs::content_sink_enable_perf_mode() == 0) {
+    nsViewManager* vm = presShell->GetViewManager();
+    NS_ENSURE_TRUE(vm, NS_ERROR_FAILURE);
+    uint32_t lastEventTime;
+    vm->GetLastUserEventTime(lastEventTime);
+
+    bool newDynLower = mDocument->IsInBackgroundWindow() ||
+                       ((currentTime - mBeginLoadTime) >
+                            StaticPrefs::content_sink_initial_perf_time() &&
+                        (currentTime - lastEventTime) <
+                            StaticPrefs::content_sink_interactive_time());
+
+    if (mDynamicLowerValue != newDynLower) {
+      mDynamicLowerValue = newDynLower;
+    }
+  }
+
+  mDeflectedCount = 0;
+  mHasPendingEvent = false;
+
+  mCurrentParseEndTime =
+      currentTime + (mDynamicLowerValue
+                         ? StaticPrefs::content_sink_interactive_parse_time()
+                         : StaticPrefs::content_sink_perf_parse_time());
+
+  return NS_OK;
+}
+
+void nsContentSink::WillBuildModelImpl() {
+  if (!mRunsToCompletion) {
+    mDocument->BlockOnload();
+    mIsBlockingOnload = true;
+
+    mBeginLoadTime = PR_IntervalToMicroseconds(PR_IntervalNow());
+  }
+
+  mDocument->ResetScrolledToRefAlready();
+
+  if (mProcessLinkHeaderEvent.get()) {
+    mProcessLinkHeaderEvent.Revoke();
+
+    DoProcessLinkHeader();
+  }
+}
+
+/* static */
+void nsContentSink::NotifyDocElementCreated(Document* aDoc) {
+  MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
+
+  nsCOMPtr<nsIObserverService> observerService =
+      mozilla::services::GetObserverService();
+  MOZ_ASSERT(observerService);
+
+  auto* win = nsGlobalWindowInner::Cast(aDoc->GetInnerWindow());
+  bool fireInitialInsertion = !win || !win->DidFireDocElemInserted();
+  if (win) {
+    win->SetDidFireDocElemInserted();
+  }
+  if (fireInitialInsertion) {
+    observerService->NotifyObservers(ToSupports(aDoc),
+                                     "initial-document-element-inserted", u"");
+  }
+  observerService->NotifyObservers(ToSupports(aDoc),
+                                   "document-element-inserted", u"");
+
+  nsContentUtils::DispatchChromeEvent(aDoc, ToSupports(aDoc),
+                                      u"DOMDocElementInserted"_ns,
+                                      CanBubble::eYes, Cancelable::eNo);
+}
+
+NS_IMETHODIMP
+nsContentSink::GetName(nsACString& aName) {
+  aName.AssignLiteral("nsContentSink_timer");
+  return NS_OK;
+}