Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp

 // Copyright 2016 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.
 
 #include "core/dom/TaskRunnerHelper.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/LocalFrame.h"
 #include "core/workers/WorkerOrWorkletGlobalScope.h"
@@ skipping 16 matching lines @@
       return frame ? frame->FrameScheduler()->LoadingTaskRunner()
                    : Platform::Current()->CurrentThread()->GetWebTaskRunner();
     // Throttling following tasks may break existing web pages, so tentatively
     // these are unthrottled.
     // TODO(nhiroki): Throttle them again after we're convinced that it's safe
     // or provide a mechanism that web pages can opt-out it if throttling is not
     // desirable.
     case TaskType::kDatabaseAccess:
       return frame ? frame->FrameScheduler()->SuspendableTaskRunner()
                    : Platform::Current()->CurrentThread()->GetWebTaskRunner();
+    case TaskType::kAnimationTimer:
+      return frame ? frame->FrameScheduler()->CompositorTaskRunner()
+                   : Platform::Current()->CurrentThread()->GetWebTaskRunner();
     case TaskType::kDOMManipulation:
     case TaskType::kUserInteraction:
     case TaskType::kHistoryTraversal:
     case TaskType::kEmbed:
     case TaskType::kMediaElementEvent:
     case TaskType::kCanvasBlobSerialization:
     case TaskType::kRemoteEvent:
     case TaskType::kWebSocket:
     case TaskType::kMicrotask:
     case TaskType::kPostedMessage:
@@ skipping 62 matching lines @@
     case TaskType::kUnshippedPortMessage:
     case TaskType::kFileReading:
     case TaskType::kDatabaseAccess:
     case TaskType::kPresentation:
     case TaskType::kSensor:
     case TaskType::kPerformanceTimeline:
     case TaskType::kWebGL:
     case TaskType::kMiscPlatformAPI:
     case TaskType::kUnspecedTimer:
     case TaskType::kUnspecedLoading:
+    case TaskType::kAnimationTimer:
     case TaskType::kUnthrottled:
       // UnthrottledTaskRunner is generally discouraged in future.
       // TODO(nhiroki): Identify which tasks can be throttled / suspendable and
       // move them into other task runners. See also comments in
       // Get(LocalFrame). (https://crbug.com/670534)
       return worker_thread->GetGlobalScopeScheduler()->UnthrottledTaskRunner();
   }
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace blink