Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/core/dom/IdleDeadlineTest.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/IdleDeadline.h"
 
 #include "platform/testing/TestingPlatformSupport.h"
 #include "platform/wtf/CurrentTime.h"
 #include "public/platform/Platform.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 13 matching lines @@
   bool ShouldYieldForHighPriorityWork() override { return true; }
   bool CanExceedIdleDeadlineIfRequired() override { return false; }
   void PostIdleTask(const WebTraceLocation&, WebThread::IdleTask*) override {}
   void PostNonNestableIdleTask(const WebTraceLocation&,
                                WebThread::IdleTask*) override {}
   std::unique_ptr<WebViewScheduler> CreateWebViewScheduler(
       InterventionReporter*,
       WebViewScheduler::WebViewSchedulerSettings*) override {
     return nullptr;
   }
+  WebTaskRunner* CompositorTaskRunner() override { return nullptr; }
   void SuspendTimerQueue() override {}
   void ResumeTimerQueue() override {}
   void AddPendingNavigation(
       scheduler::RendererScheduler::NavigatingFrameType) override {}
   void RemovePendingNavigation(
       scheduler::RendererScheduler::NavigatingFrameType) override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockScheduler);
 };
@@ skipping 52 matching lines @@
 
 TEST_F(IdleDeadlineTest, yieldForHighPriorityWork) {
   ScopedTestingPlatformSupport<MockPlatform> platform;
 
   IdleDeadline* deadline =
       IdleDeadline::Create(1.25, IdleDeadline::CallbackType::kCalledWhenIdle);
   EXPECT_FLOAT_EQ(0, deadline->timeRemaining());
 }
 
 }  // namespace blink