Bug 1576627 - Move MaybeNotifyAutoplayBlocked from Document to HTMLMediaElement; r=alwu

Given that it is used only in HTMLMediaElement.

Differential Revision: https://phabricator.services.mozilla.com/D43452

--HG--
extra : moz-landing-system : lando

dom/base/Document.cpp

@@ -14822,20 +14822,6 @@ bool Document::HasBeenUserGestureActivated() {
   return bc->GetUserGestureActivation();
 }
 
-void Document::MaybeNotifyAutoplayBlocked() {
-  Document* topLevelDoc = GetTopLevelContentDocument();
-  if (!topLevelDoc) {
-    return;
-  }
-
-  // This event is used to notify front-end side that we've blocked autoplay,
-  // so front-end side should show blocking icon as well.
-  RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
-      topLevelDoc, NS_LITERAL_STRING("GloballyAutoplayBlocked"),
-      CanBubble::eYes, ChromeOnlyDispatch::eYes);
-  asyncDispatcher->PostDOMEvent();
-}
-
 void Document::ClearUserGestureActivation() {
   if (!HasBeenUserGestureActivated()) {
     return;

dom/base/Document.h

@@ -4117,10 +4117,6 @@ class Document : public nsINode,
 
   void ReportShadowDOMUsage();
 
-  // When the doc is blocked permanantly, we would dispatch event to notify
-  // front-end side to show blocking icon.
-  void MaybeNotifyAutoplayBlocked();
-
   // Sets flags for media autoplay telemetry.
   void SetDocTreeHadAudibleMedia();
   void SetDocTreeHadPlayRevoked();

dom/html/HTMLMediaElement.cpp

@@ -3876,12 +3876,26 @@ void HTMLMediaElement::DispatchEventsWhenPlayWasNotAllowed() {
       ChromeOnlyDispatch::eYes);
   asyncDispatcher->PostDOMEvent();
 #endif
-  OwnerDoc()->MaybeNotifyAutoplayBlocked();
+  MaybeNotifyAutoplayBlocked();
   ReportToConsole(nsIScriptError::warningFlag, "BlockAutoplayError");
   mHasPlayEverBeenBlocked = true;
   mHasEverBeenBlockedForAutoplay = true;
 }
 
+void HTMLMediaElement::MaybeNotifyAutoplayBlocked() {
+  Document* topLevelDoc = OwnerDoc()->GetTopLevelContentDocument();
+  if (!topLevelDoc) {
+    return;
+  }
+
+  // This event is used to notify front-end side that we've blocked autoplay,
+  // so front-end side should show blocking icon as well.
+  RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
+      topLevelDoc, NS_LITERAL_STRING("GloballyAutoplayBlocked"),
+      CanBubble::eYes, ChromeOnlyDispatch::eYes);
+  asyncDispatcher->PostDOMEvent();
+}
+
 void HTMLMediaElement::PlayInternal(bool aHandlingUserInput) {
   if (mPreloadAction == HTMLMediaElement::PRELOAD_NONE) {
     // The media load algorithm will be initiated by a user interaction.
@@ -6099,7 +6113,7 @@ void HTMLMediaElement::SuspendOrResumeElement(bool aPauseElement,
       // blocked.
       if (mHasEverBeenBlockedForAutoplay &&
           !AutoplayPolicy::IsAllowedToPlay(*this)) {
-        OwnerDoc()->MaybeNotifyAutoplayBlocked();
+        MaybeNotifyAutoplayBlocked();
       }
     }
   }

dom/html/HTMLMediaElement.h

@@ -1306,6 +1306,10 @@ class HTMLMediaElement : public nsGenericHTMLElement,
   // testing or changing control UI.
   void DispatchEventsWhenPlayWasNotAllowed();
 
+  // When the doc is blocked permanantly, we would dispatch event to notify
+  // front-end side to show blocking icon.
+  void MaybeNotifyAutoplayBlocked();
+
   // The current decoder. Load() has been called on this decoder.
   // At most one of mDecoder and mSrcStream can be non-null.
   RefPtr<MediaDecoder> mDecoder;