Bug 1328658 - Notify main thread of a failed attempt to start an APZ scrollbar drag. r=kats,tnikkel

MozReview-Commit-ID: ERm1sVNfoKL

gfx/layers/ipc/RemoteContentController.cpp

@@ -244,6 +244,21 @@ RemoteContentController::NotifyFlushComplete()
   }
 }
 
+void
+RemoteContentController::NotifyAsyncScrollbarDragRejected(const FrameMetrics::ViewID& aScrollId)
+{
+  if (MessageLoop::current() != mCompositorThread) {
+    // We have to send messages from the compositor thread
+    mCompositorThread->PostTask(NewRunnableMethod<FrameMetrics::ViewID>(this,
+        &RemoteContentController::NotifyAsyncScrollbarDragRejected, aScrollId));
+    return;
+  }
+
+  if (mCanSend) {
+    Unused << SendNotifyAsyncScrollbarDragRejected(aScrollId);
+  }
+}
+
 void
 RemoteContentController::ActorDestroy(ActorDestroyReason aWhy)
 {