Bug 1346498 part 1 - extract the MediaDecoder::NotifyCompositor() method; r=jwwang

MozReview-Commit-ID: Hfw3FJUSVVe

--HG--
extra : rebase_source : 738cb2e341ab03d0dc189facc950314c29a3721b
extra : source : 63f67483e45c8a73eda772f264d2424a1049320f

dom/media/MediaDecoder.cpp

@@ -303,18 +303,7 @@ MediaDecoder::NotifyOwnerActivityChanged(bool aIsVisible)
   MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
   SetElementVisibility(aIsVisible);
 
-  MediaDecoderOwner* owner = GetOwner();
-  NS_ENSURE_TRUE_VOID(owner);
-
-  dom::HTMLMediaElement* element = owner->GetMediaElement();
-  NS_ENSURE_TRUE_VOID(element);
-
-  RefPtr<LayerManager> layerManager =
-    nsContentUtils::LayerManagerForDocument(element->OwnerDoc());
-  if (layerManager) {
-    RefPtr<KnowsCompositor> knowsCompositor = layerManager->AsShadowForwarder();
-    mCompositorUpdatedEvent.Notify(knowsCompositor);
-  }
+  NotifyCompositor();
 }
 
 void
@@ -1299,6 +1288,23 @@ MediaDecoder::DurationChanged()
   }
 }
 
+void
+MediaDecoder::NotifyCompositor()
+{
+  MediaDecoderOwner* owner = GetOwner();
+  NS_ENSURE_TRUE_VOID(owner);
+
+  dom::HTMLMediaElement* element = owner->GetMediaElement();
+  NS_ENSURE_TRUE_VOID(element);
+
+  RefPtr<LayerManager> layerManager =
+    nsContentUtils::LayerManagerForDocument(element->OwnerDoc());
+  if (layerManager) {
+    RefPtr<KnowsCompositor> knowsCompositor = layerManager->AsShadowForwarder();
+    mCompositorUpdatedEvent.Notify(knowsCompositor);
+  }
+}
+
 void
 MediaDecoder::SetElementVisibility(bool aIsVisible)
 {

dom/media/MediaDecoder.h

@@ -590,6 +590,9 @@ private:
   MediaEventSource<void>*
   DataArrivedEvent() override { return &mDataArrivedEvent; }
 
+  // Called when the owner's activity changed.
+  void NotifyCompositor();
+
   MediaEventSource<RefPtr<layers::KnowsCompositor>>*
   CompositorUpdatedEvent() override { return &mCompositorUpdatedEvent; }