Add a unit test expection for calling the render scheduler on coalesced events.

third_party/WebKit/public/blink_headers.gypi

 # 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.
 
 {
   'variables': {
     'blink_public_sources': [
       "platform/callback/WebClosure.h",
       "platform/Platform.h",
       "platform/FilePathConversion.h",
@@ skipping 305 matching lines @@
       "platform/scheduler/base/task_queue.h",
       "platform/scheduler/child/child_scheduler.h",
       "platform/scheduler/child/compositor_worker_scheduler.h",
       "platform/scheduler/child/single_thread_idle_task_runner.h",
       "platform/scheduler/child/webthread_base.h",
       "platform/scheduler/child/webthread_impl_for_worker_scheduler.h",
       "platform/scheduler/child/worker_scheduler.h",
       "platform/scheduler/renderer/render_widget_scheduling_state.h",
       "platform/scheduler/renderer/renderer_scheduler.h",
       "platform/scheduler/test/fake_renderer_scheduler.h",
+      "platform/scheduler/test/mock_renderer_scheduler.h",
       "platform/scheduler/test/renderer_scheduler_test_support.h",
       "platform/scheduler/utility/webthread_impl_for_utility_thread.h",
       "web/WebAXEnums.h",
       "web/WebAXObject.h",
       "web/WebActiveWheelFlingParameters.h",
       "web/WebArrayBuffer.h",
       "web/WebArrayBufferConverter.h",
       "web/WebArrayBufferView.h",
       "web/WebAutofillClient.h",
       "web/WebBlob.h",
@@ skipping 148 matching lines @@
       "web/mac/WebScrollbarTheme.h",
       "web/mac/WebSubstringUtil.h",
       "web/modules/notifications/WebNotificationPermissionCallback.h",
       "web/modules/serviceworker/WebServiceWorkerContextClient.h",
       "web/modules/serviceworker/WebServiceWorkerContextProxy.h",
       "web/modules/serviceworker/WebServiceWorkerNetworkProvider.h",
       "web/win/WebFontRendering.h",
     ],
   },
 }