2 files changed, 15 insertions, 5 deletions
diff --git a/gfx/layers/AnimationInfo.cpp b/gfx/layers/AnimationInfo.cpp
index 81d11f672c..ad43fd681f 100644
--- a/gfx/layers/AnimationInfo.cpp
+++ b/gfx/layers/AnimationInfo.cpp
@@ -494,11 +494,15 @@ void AnimationInfo::AddAnimationForProperty(
   }
 
   if (aAnimation->Pending()) {
-    const TimeStamp readyTime =
-        aFrame->PresContext()->RefreshDriver()->MostRecentRefresh(
-            /* aEnsureTimerStarted= */ false);
-    MOZ_ASSERT(!readyTime.IsNull());
-    aAnimation->SetPendingReadyTime(readyTime);
+    TimeStamp readyTime = aAnimation->GetPendingReadyTime();
+    if (readyTime.IsNull()) {
+      // TODO(emilio): This should generally not happen anymore, can we remove
+      // this SetPendingReadyTime call?
+      readyTime = aFrame->PresContext()->RefreshDriver()->MostRecentRefresh(
+          /* aEnsureTimerStarted= */ false);
+      MOZ_ASSERT(!readyTime.IsNull());
+      aAnimation->SetPendingReadyTime(readyTime);
+    }
     MaybeStartPendingAnimation(*animation, readyTime);
   }
 }
diff --git a/gfx/thebes/gfxPlatformFontList.cpp b/gfx/thebes/gfxPlatformFontList.cpp
index bc0e123f85..404d291e03 100644
--- a/gfx/thebes/gfxPlatformFontList.cpp
+++ b/gfx/thebes/gfxPlatformFontList.cpp
@@ -2209,6 +2209,12 @@ eFontPrefLang gfxPlatformFontList::GetFontPrefLangFor(const char* aLang) {
     if (!nsCRT::strcasecmp(gPrefLangNames[i], aLang)) {
       return eFontPrefLang(i);
     }
+    // If the pref-lang is a two-character lang tag, try ignoring any trailing
+    // subtags in aLang and see if the base lang matches.
+    if (strlen(gPrefLangNames[i]) == 2 && strlen(aLang) > 3 &&
+        aLang[2] == '-' && !nsCRT::strncasecmp(gPrefLangNames[i], aLang, 2)) {
+      return eFontPrefLang(i);
+    }
   }
   return eFontPrefLang_Others;
 }