/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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/. */

#include "nsISupports.idl"

interface nsIWebProgress;
interface nsIRequest;
interface nsIURI;

/**
 * The nsIWebProgressListener interface is implemented by clients wishing to
 * listen in on the progress associated with the loading of asynchronous
 * requests in the context of a nsIWebProgress instance as well as any child
 * nsIWebProgress instances.  nsIWebProgress.idl describes the parent-child
 * relationship of nsIWebProgress instances.
 */
[scriptable, uuid(a9df523b-efe2-421e-9d8e-3d7f807dda4c)]
interface nsIWebProgressListener : nsISupports
{
  /**
   * State Transition Flags
   *
   * These flags indicate the various states that requests may transition
   * through as they are being loaded.  These flags are mutually exclusive.
   *
   * For any given request, onStateChange is called once with the STATE_START
   * flag, zero or more times with the STATE_TRANSFERRING flag or once with the
   * STATE_REDIRECTING flag, and then finally once with the STATE_STOP flag.
   * NOTE: For document requests, a second STATE_STOP is generated (see the
   * description of STATE_IS_WINDOW for more details).
   *
   * STATE_START
   *   This flag indicates the start of a request.  This flag is set when a
   *   request is initiated.  The request is complete when onStateChange is
   *   called for the same request with the STATE_STOP flag set.
   *
   * STATE_REDIRECTING
   *   This flag indicates that a request is being redirected.  The request
   *   passed to onStateChange is the request that is being redirected.  When a
   *   redirect occurs, a new request is generated automatically to process the
   *   new request.  Expect a corresponding STATE_START event for the new
   *   request, and a STATE_STOP for the redirected request.
   *
   * STATE_TRANSFERRING
   *   This flag indicates that data for a request is being transferred to an
   *   end consumer.  This flag indicates that the request has been targeted,
   *   and that the user may start seeing content corresponding to the request.
   *
   * STATE_NEGOTIATING
   *   This flag is not used.
   *
   * STATE_STOP
   *   This flag indicates the completion of a request.  The aStatus parameter
   *   to onStateChange indicates the final status of the request.
   */
  const unsigned long STATE_START          = 0x00000001;
  const unsigned long STATE_REDIRECTING    = 0x00000002;
  const unsigned long STATE_TRANSFERRING   = 0x00000004;
  const unsigned long STATE_NEGOTIATING    = 0x00000008;
  const unsigned long STATE_STOP           = 0x00000010;


  /**
   * State Type Flags
   *
   * These flags further describe the entity for which the state transition is
   * occuring.  These flags are NOT mutually exclusive (i.e., an onStateChange
   * event may indicate some combination of these flags).
   *
   * STATE_IS_REQUEST
   *   This flag indicates that the state transition is for a request, which
   *   includes but is not limited to document requests.  (See below for a
   *   description of document requests.)  Other types of requests, such as
   *   requests for inline content (e.g., images and stylesheets) are
   *   considered normal requests.
   *
   * STATE_IS_DOCUMENT
   *   This flag indicates that the state transition is for a document request.
   *   This flag is set in addition to STATE_IS_REQUEST.  A document request
   *   supports the nsIChannel interface and its loadFlags attribute includes
   *   the nsIChannel::LOAD_DOCUMENT_URI flag.
   *
   *   A document request does not complete until all requests associated with
   *   the loading of its corresponding document have completed.  This includes
   *   other document requests (e.g., corresponding to HTML <iframe> elements).
   *   The document corresponding to a document request is available via the
   *   DOMWindow attribute of onStateChange's aWebProgress parameter.
   *
   * STATE_IS_NETWORK
   *   This flag indicates that the state transition corresponds to the start
   *   or stop of activity in the indicated nsIWebProgress instance.  This flag
   *   is accompanied by either STATE_START or STATE_STOP, and it may be
   *   combined with other State Type Flags.
   *
   *   Unlike STATE_IS_WINDOW, this flag is only set when activity within the
   *   nsIWebProgress instance being observed starts or stops.  If activity
   *   only occurs in a child nsIWebProgress instance, then this flag will be
   *   set to indicate the start and stop of that activity.
   *
   *   For example, in the case of navigation within a single frame of a HTML
   *   frameset, a nsIWebProgressListener instance attached to the
   *   nsIWebProgress of the frameset window will receive onStateChange calls
   *   with the STATE_IS_NETWORK flag set to indicate the start and stop of
   *   said navigation.  In other words, an observer of an outer window can
   *   determine when activity, that may be constrained to a child window or
   *   set of child windows, starts and stops.
   *
   * STATE_IS_WINDOW
   *   This flag indicates that the state transition corresponds to the start
   *   or stop of activity in the indicated nsIWebProgress instance.  This flag
   *   is accompanied by either STATE_START or STATE_STOP, and it may be
   *   combined with other State Type Flags.
   *
   *   This flag is similar to STATE_IS_DOCUMENT.  However, when a document
   *   request completes, two onStateChange calls with STATE_STOP are
   *   generated.  The document request is passed as aRequest to both calls.
   *   The first has STATE_IS_REQUEST and STATE_IS_DOCUMENT set, and the second
   *   has the STATE_IS_WINDOW flag set (and possibly the STATE_IS_NETWORK flag
   *   set as well -- see above for a description of when the STATE_IS_NETWORK
   *   flag may be set).  This second STATE_STOP event may be useful as a way
   *   to partition the work that occurs when a document request completes.
   *
   * STATE_IS_REDIRECTED_DOCUMENT
   *  Same as STATE_IS_DOCUMENT, but sent only after a redirect has occured.
   *  Introduced in order not to confuse existing code with extra state change
   *  events. See |nsDocLoader::OnStartRequest| for more info.
   */
  const unsigned long STATE_IS_REQUEST     = 0x00010000;
  const unsigned long STATE_IS_DOCUMENT    = 0x00020000;
  const unsigned long STATE_IS_NETWORK     = 0x00040000;
  const unsigned long STATE_IS_WINDOW      = 0x00080000;
  const unsigned long STATE_IS_REDIRECTED_DOCUMENT = 0x00100000;

  /**
   * State Modifier Flags
   *
   * These flags further describe the transition which is occuring.  These
   * flags are NOT mutually exclusive (i.e., an onStateChange event may
   * indicate some combination of these flags).
   *
   * STATE_RESTORING
   *   This flag indicates that the state transition corresponds to the start
   *   or stop of activity for restoring a previously-rendered presentation.
   *   As such, there is no actual network activity associated with this
   *   request, and any modifications made to the document or presentation
   *   when it was originally loaded will still be present.
   */
  const unsigned long STATE_RESTORING      = 0x01000000;

  /**
   * State Security Flags
   *
   * These flags describe the security state reported by a call to the
   * onSecurityChange method.  These flags are mutually exclusive.
   *
   * STATE_IS_INSECURE
   *   This flag indicates that the data corresponding to the request
   *   was received over an insecure channel.
   *
   * STATE_IS_BROKEN
   *   This flag indicates an unknown security state.  This may mean that the
   *   request is being loaded as part of a page in which some content was
   *   received over an insecure channel.
   *
   * STATE_IS_SECURE
   *   This flag indicates that the data corresponding to the request was
   *   received over a secure channel.  The degree of security is expressed by
   *   STATE_SECURE_HIGH, STATE_SECURE_MED, or STATE_SECURE_LOW.
   */
  const unsigned long STATE_IS_INSECURE     = 0x00000004;
  const unsigned long STATE_IS_BROKEN       = 0x00000001;
  const unsigned long STATE_IS_SECURE       = 0x00000002;

  /**
   * Mixed active content flags
   *
   * NOTE: IF YOU ARE ADDING MORE OF THESE FLAGS, MAKE SURE TO EDIT
   * nsSecureBrowserUIImpl::CheckForBlockedContent().
   *
   * May be set in addition to the State Security Flags, to indicate that
   * mixed active content has been encountered.
   *
   * STATE_BLOCKED_MIXED_ACTIVE_CONTENT
   *   Mixed active content has been blocked from loading.
   *
   * STATE_LOADED_MIXED_ACTIVE_CONTENT
   *   Mixed active content has been loaded. State should be STATE_IS_BROKEN.
   */
  const unsigned long STATE_BLOCKED_MIXED_ACTIVE_CONTENT  = 0x00000010;
  const unsigned long STATE_LOADED_MIXED_ACTIVE_CONTENT   = 0x00000020;

  /**
   * Mixed display content flags
   *
   * NOTE: IF YOU ARE ADDING MORE OF THESE FLAGS, MAKE SURE TO EDIT
   * nsSecureBrowserUIImpl::CheckForBlockedContent().
   *
   * May be set in addition to the State Security Flags, to indicate that
   * mixed display content has been encountered.
   *
   * STATE_BLOCKED_MIXED_DISPLAY_CONTENT
   *   Mixed display content has been blocked from loading.
   *
   * STATE_LOADED_MIXED_DISPLAY_CONTENT
   *   Mixed display content has been loaded. State should be STATE_IS_BROKEN.
   */
  const unsigned long STATE_BLOCKED_MIXED_DISPLAY_CONTENT = 0x00000100;
  const unsigned long STATE_LOADED_MIXED_DISPLAY_CONTENT  = 0x00000200;

  /**
    * State bits for EV == Extended Validation == High Assurance
    *
    * These flags describe the level of identity verification
    * in a call to the onSecurityChange method.
    *
    * STATE_IDENTITY_EV_TOPLEVEL
    *   The topmost document uses an EV cert.
    *   NOTE: Available since Gecko 1.9
    */

  const unsigned long STATE_IDENTITY_EV_TOPLEVEL    = 0x00100000;

  /**
    * Broken state flags
    *
    * These flags describe the reason of the broken state.
    *
    * STATE_USES_SSL_3
    *   The topmost document uses SSL 3.0.
    *
    * STATE_USES_WEAK_CRYPTO
    *   The topmost document uses a weak cipher suite such as RC4.
    *
    * STATE_CERT_USER_OVERRIDDEN
    *   The user has added a security exception for the site.
    */
  const unsigned long STATE_USES_SSL_3                = 0x01000000;
  const unsigned long STATE_USES_WEAK_CRYPTO          = 0x02000000;
  const unsigned long STATE_CERT_USER_OVERRIDDEN      = 0x04000000;

  /**
   * Content Blocking Event flags
   *
   * NOTE: IF YOU ARE ADDING MORE OF THESE FLAGS, MAKE SURE TO EDIT
   * nsSecureBrowserUIImpl::CheckForBlockedContent() AND UPDATE THE
   * CORRESPONDING LIST IN ContentBlockingController.java
   *
   * These flags describe the reason of cookie jar rejection.
   *
   * STATE_BLOCKED_TRACKING_CONTENT
   *   Tracking content has been blocked from loading.
   *
   * STATE_LOADED_LEVEL_1_TRACKING_CONTENT
   *   Tracking content from the Disconnect Level 1 list has been loaded.
   *
   * STATE_LOADED_LEVEL_2_TRACKING_CONTENT
   *   Tracking content from the Disconnect Level 2 list has been loaded.
   *
   * STATE_BLOCKED_FINGERPRINTING_CONTENT
   *   Fingerprinting content has been blocked from loading.
   *
   * STATE_LOADED_FINGERPRINTING_CONTENT
   *   Fingerprinting content has been loaded.
   *
   * STATE_REPLACED_FINGERPRINTING_CONTENT
   *   Fingerprinting content which should be blocked from loading was replaced with a
   *   shim.
   *
   * STATE_ALLOWED_FINGERPRINTING_CONTENT
   *   Fingerprinting content which should be blocked from loading was allowed.
   *
   * STATE_BLOCKED_CRYPTOMINING_CONTENT
   *   Cryptomining content has been blocked from loading.
   *
   * STATE_LOADED_CRYPTOMINING_CONTENT
   *   Cryptomining content has been loaded.
   *
   * STATE_BLOCKED_UNSAFE_CONTENT
   *   Content which againts SafeBrowsing list has been blocked from loading.
   *
   * STATE_COOKIES_LOADED
   *   Performed a storage access check, which usually means something like a
   *   cookie or a storage item was loaded/stored on the current tab.
   *   Alternatively this could indicate that something in the current tab
   *   attempted to communicate with its same-origin counterparts in other
   *   tabs.
   *
   * STATE_COOKIES_LOADED_TRACKER
   *   Similar to STATE_COOKIES_LOADED, but only sent if the subject of the
   *   action was a third-party tracker when the active cookie policy imposes
   *   restrictions on such content.
   *
   * STATE_COOKIES_LOADED_SOCIALTRACKER
   *   Similar to STATE_COOKIES_LOADED, but only sent if the subject of the
   *   action was a third-party social tracker when the active cookie policy
   *   imposes restrictions on such content.
   *
   * STATE_COOKIES_BLOCKED_BY_PERMISSION
   *   Rejected for custom site permission.
   *
   * STATE_COOKIES_BLOCKED_TRACKER
   *   Rejected because the resource is a tracker and cookie policy doesn't
   *   allow its loading.
   *
   * STATE_COOKIES_BLOCKED_SOCIALTRACKER
   *   Rejected because the resource is a tracker from a social origin and
   *   cookie policy doesn't allow its loading.
   *
   * STATE_COOKIES_PARTITIONED_FOREIGN
   *   Rejected because the resource is a third-party and cookie policy forces
   *   third-party resources to be partitioned.
   *
   * STATE_COOKIES_BLOCKED_ALL
   *   Rejected because cookie policy blocks all cookies.
   *
   * STATE_COOKIES_BLOCKED_FOREIGN
   *   Rejected because cookie policy blocks 3rd party cookies.
   *
   * STATE_BLOCKED_SOCIALTRACKING_CONTENT
   *   SocialTracking content has been blocked from loading.
   *
   * STATE_LOADED_SOCIALTRACKING_CONTENT
   *   SocialTracking content has been loaded.
   *
   * STATE_REPLACED_TRACKING_CONTENT
   *   Tracking content which should be blocked from loading was replaced with a
   *   shim.
   *
   * STATE_ALLOWED_TRACKING_CONTENT
   *   Tracking content which should be blocked from loading was allowed.
   *
   * STATE_BLOCKED_EMAILTRACING_CONTENT
   *   EmailTracking content has been blocked from loading.
   *
   * STATE_LOADED_EMAILTRACKING_LEVEL_1_CONTENT
   *   EmailTracking content from the Disconnect level 1 has been loaded.
   *
   * STATE_LOADED_EMAILTRACKING_LEVEL_2_CONTENT
   *   EmailTracking content from the Disconnect level 2 has been loaded.
   */
  const unsigned long STATE_BLOCKED_TRACKING_CONTENT             = 0x00001000;
  const unsigned long STATE_LOADED_LEVEL_1_TRACKING_CONTENT      = 0x00002000;
  const unsigned long STATE_LOADED_LEVEL_2_TRACKING_CONTENT      = 0x00100000;
  const unsigned long STATE_BLOCKED_FINGERPRINTING_CONTENT       = 0x00000040;
  const unsigned long STATE_LOADED_FINGERPRINTING_CONTENT        = 0x00000400;
  const unsigned long STATE_REPLACED_FINGERPRINTING_CONTENT      = 0x08000000;
  const unsigned long STATE_ALLOWED_FINGERPRINTING_CONTENT       = 0x00000200;
  const unsigned long STATE_BLOCKED_CRYPTOMINING_CONTENT         = 0x00000800;
  const unsigned long STATE_LOADED_CRYPTOMINING_CONTENT          = 0x00200000;
  const unsigned long STATE_BLOCKED_UNSAFE_CONTENT               = 0x00004000;
  const unsigned long STATE_COOKIES_LOADED                       = 0x00008000;
  const unsigned long STATE_COOKIES_LOADED_TRACKER               = 0x00040000;
  const unsigned long STATE_COOKIES_LOADED_SOCIALTRACKER         = 0x00080000;
  const unsigned long STATE_COOKIES_BLOCKED_BY_PERMISSION        = 0x10000000;
  const unsigned long STATE_COOKIES_BLOCKED_TRACKER              = 0x20000000;
  const unsigned long STATE_COOKIES_BLOCKED_SOCIALTRACKER        = 0x01000000;
  const unsigned long STATE_COOKIES_BLOCKED_ALL                  = 0x40000000;
  const unsigned long STATE_COOKIES_PARTITIONED_FOREIGN          = 0x80000000;
  const unsigned long STATE_COOKIES_BLOCKED_FOREIGN              = 0x00000080;
  const unsigned long STATE_BLOCKED_SOCIALTRACKING_CONTENT       = 0x00010000;
  const unsigned long STATE_LOADED_SOCIALTRACKING_CONTENT        = 0x00020000;
  const unsigned long STATE_REPLACED_TRACKING_CONTENT            = 0x00000010;
  const unsigned long STATE_ALLOWED_TRACKING_CONTENT             = 0x00000020;
  const unsigned long STATE_BLOCKED_EMAILTRACKING_CONTENT        = 0x00400000;
  const unsigned long STATE_LOADED_EMAILTRACKING_LEVEL_1_CONTENT = 0x00800000;
  const unsigned long STATE_LOADED_EMAILTRACKING_LEVEL_2_CONTENT = 0x00000100;

  /**
   * Flag for HTTPS-Only Mode upgrades
   *
   * STATE_HTTPS_ONLY_MODE_UPGRADED
   *   When a request has been upgraded by HTTPS-Only Mode
   *
   * STATE_HTTPS_ONLY_MODE_UPGRADE_FAILED
   *   When an upgraded request failed.
   */
  const unsigned long STATE_HTTPS_ONLY_MODE_UPGRADED        = 0x00400000;
  const unsigned long STATE_HTTPS_ONLY_MODE_UPGRADE_FAILED  = 0x00800000;

  /**
   * Notification indicating the state has changed for one of the requests
   * associated with aWebProgress.
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification
   * @param aRequest
   *        The nsIRequest that has changed state.
   * @param aStateFlags
   *        Flags indicating the new state.  This value is a combination of one
   *        of the State Transition Flags and one or more of the State Type
   *        Flags defined above.  Any undefined bits are reserved for future
   *        use.
   * @param aStatus
   *        Error status code associated with the state change.  This parameter
   *        should be ignored unless aStateFlags includes the STATE_STOP bit.
   *        The status code indicates success or failure of the request
   *        associated with the state change.  NOTE: aStatus may be a success
   *        code even for server generated errors, such as the HTTP 404 error.
   *        In such cases, the request itself should be queried for extended
   *        error information (e.g., for HTTP requests see nsIHttpChannel).
   */
  void onStateChange(in nsIWebProgress aWebProgress,
                     in nsIRequest aRequest,
                     in unsigned long aStateFlags,
                     in nsresult aStatus);

  /**
   * Notification that the progress has changed for one of the requests
   * associated with aWebProgress.  Progress totals are reset to zero when all
   * requests in aWebProgress complete (corresponding to onStateChange being
   * called with aStateFlags including the STATE_STOP and STATE_IS_WINDOW
   * flags).
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The nsIRequest that has new progress.
   * @param aCurSelfProgress
   *        The current progress for aRequest.
   * @param aMaxSelfProgress
   *        The maximum progress for aRequest.
   * @param aCurTotalProgress
   *        The current progress for all requests associated with aWebProgress.
   * @param aMaxTotalProgress
   *        The total progress for all requests associated with aWebProgress.
   *
   * NOTE: If any progress value is unknown, or if its value would exceed the
   * maximum value of type long, then its value is replaced with -1.
   *
   * NOTE: If the object also implements nsIWebProgressListener2 and the caller
   * knows about that interface, this function will not be called. Instead,
   * nsIWebProgressListener2::onProgressChange64 will be called.
   */
  void onProgressChange(in nsIWebProgress aWebProgress,
                        in nsIRequest aRequest,
                        in long aCurSelfProgress,
                        in long aMaxSelfProgress,
                        in long aCurTotalProgress,
                        in long aMaxTotalProgress);

  /**
   * Flags for onLocationChange
   *
   * LOCATION_CHANGE_SAME_DOCUMENT
   *   This flag is on when |aWebProgress| did not load a new document.
   *   For example, the location change is due to an anchor scroll or a
   *   pushState/popState/replaceState.
   *
   * LOCATION_CHANGE_ERROR_PAGE
   *   This flag is on when |aWebProgress| redirected from the requested
   *   contents to an internal page to show error status, such as
   *   <about:neterror>, <about:certerror> and so on.
   *
   *   Generally speaking, |aURI| and |aRequest| are the original data. DOM
   *   |window.location.href| is also the original location, while
   *   |document.documentURI| is the redirected location. Sometimes |aURI| is
   *   <about:blank> and |aRequest| is null when the original data does not
   +   remain.
   *
   *   |aWebProgress| does NOT set this flag when it did not try to load a new
   *   document. In this case, it should set LOCATION_CHANGE_SAME_DOCUMENT.
   *
   * LOCATION_CHANGE_RELOAD
   *   This flag is on when reloading the current page, either from
   *   location.reload() or the browser UI.
   *
   * LOCATION_CHANGE_HASHCHANGE
   *   This flag is on for same-document location changes where only the URI's
   *   reference fragment has changed. This flag implies
   *   LOCATION_CHANGE_SAME_DOCUMENT.
   *
   * LOCATION_CHANGE_SESSION_STORE
   *   This flag is on for location changes that are the result of the session
   *   store updating the URI of aWebProgress without actually navigating.
   */
  const unsigned long LOCATION_CHANGE_SAME_DOCUMENT   = 0x00000001;
  const unsigned long LOCATION_CHANGE_ERROR_PAGE      = 0x00000002;
  const unsigned long LOCATION_CHANGE_RELOAD          = 0x00000004;
  const unsigned long LOCATION_CHANGE_HASHCHANGE      = 0x00000008;
  const unsigned long LOCATION_CHANGE_SESSION_STORE   = 0x00000010;

  /**
   * Called when the location of the window being watched changes.  This is not
   * when a load is requested, but rather once it is verified that the load is
   * going to occur in the given window.  For instance, a load that starts in a
   * window might send progress and status messages for the new site, but it
   * will not send the onLocationChange until we are sure that we are loading
   * this new page here.
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The associated nsIRequest.  This may be null in some cases.
   * @param aLocation
   *        The URI of the location that is being loaded.
   * @param aFlags
   *        This is a value which explains the situation or the reason why
   *        the location has changed.
   */
  void onLocationChange(in nsIWebProgress aWebProgress,
                        in nsIRequest aRequest,
                        in nsIURI aLocation,
                        [optional] in unsigned long aFlags);

  /**
   * Notification that the status of a request has changed.  The status message
   * is intended to be displayed to the user (e.g., in the status bar of the
   * browser).
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The nsIRequest that has new status.
   * @param aStatus
   *        This value is not an error code.  Instead, it is a numeric value
   *        that indicates the current status of the request.  This interface
   *        does not define the set of possible status codes.  NOTE: Some
   *        status values are defined by nsITransport and nsISocketTransport.
   * @param aMessage
   *        Localized text corresponding to aStatus.
   */
  void onStatusChange(in nsIWebProgress aWebProgress,
                      in nsIRequest aRequest,
                      in nsresult aStatus,
                      in wstring aMessage);

  /**
   * Notification called for security progress.  This method will be called on
   * security transitions (eg HTTP -> HTTPS, HTTPS -> HTTP, FOO -> HTTPS) and
   * after document load completion.  It might also be called if an error
   * occurs during network loading.
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The nsIRequest that has new security state.
   * @param aState
   *        A value composed of the Security State Flags and the Security
   *        Strength Flags listed above.  Any undefined bits are reserved for
   *        future use.
   *
   * NOTE: These notifications will only occur if a security package is
   * installed.
   */
  void onSecurityChange(in nsIWebProgress aWebProgress,
                        in nsIRequest aRequest,
                        in unsigned long aState);

  /**
   * Notification called for content blocking events.  This method will be
   * called when content gets allowed/blocked for various reasons per the
   * Content Blocking rules.
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The nsIRequest that has new security state.
   * @param aEvent
   *        A value composed of the Content Blocking Event Flags listed above.
   *        Any undefined bits are reserved for future use.
   */
  void onContentBlockingEvent(in nsIWebProgress aWebProgress,
                              in nsIRequest aRequest,
                              in unsigned long aEvent);
};