Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/platform/WebFrameScheduler.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebFrameScheduler_h
 #define WebFrameScheduler_h
 
 #include "platform/wtf/RefPtr.h"
 
 #include <memory>
@@ skipping 33 matching lines @@
   virtual void SetCrossOrigin(bool) {}
 
   // Returns the WebTaskRunner for loading tasks.
   // WebFrameScheduler owns the returned WebTaskRunner.
   virtual RefPtr<WebTaskRunner> LoadingTaskRunner() = 0;
 
   // Returns the WebTaskRunner for timer tasks.
   // WebFrameScheduler owns the returned WebTaskRunner.
   virtual RefPtr<WebTaskRunner> TimerTaskRunner() = 0;
 
+  // Returns the WebTaskRunner for compositor tasks.
+  // WebFrameScheduler owns the returned WebTaskRunner.

[Sami, 2017/04/27 17:38:17]

Hmm, this comment about ownership doesn't make sense since the return value is
refcounted :P

[Dan Elphick, 2017/05/03 09:41:06]

no longer required

+  virtual RefPtr<WebTaskRunner> CompositorTaskRunner() = 0;
+
   // Returns the WebTaskRunner for tasks which shouldn't get throttled,
   // but can be suspended.
   // TODO(altimin): This is a transitional task runner. Unthrottled task runner
   // would become suspendable in the nearest future and a new unsuspended
   // task runner will be added.
   virtual RefPtr<WebTaskRunner> SuspendableTaskRunner() = 0;
 
   // Returns the WebTaskRunner for tasks which should never get throttled.
   // This is generally used for executing internal browser tasks which should
   // never be throttled. Ideally only tasks whose performance characteristics
@@ skipping 26 matching lines @@
   // connection (websocket, webrtc, etc). When connection is closed this handle
   // must be destroyed.
   virtual std::unique_ptr<ActiveConnectionHandle> OnActiveConnectionCreated() {
     return nullptr;
   };
 };
 
 }  // namespace blink
 
 #endif  // WebFrameScheduler_h