Force-generate a frame before the end of a layout test.

components/test_runner/test_runner.h

 // Copyright 2014 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 COMPONENTS_TEST_RUNNER_TEST_RUNNER_H_
 #define COMPONENTS_TEST_RUNNER_TEST_RUNNER_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 68 matching lines @@
   void SetTestIsRunning(bool);
   bool TestIsRunning() const { return test_is_running_; }
 
   bool UseMockTheme() const { return use_mock_theme_; }
 
   // WebTestRunner implementation.
   bool ShouldGeneratePixelResults() override;
   bool ShouldDumpAsAudio() const override;
   void GetAudioData(std::vector<unsigned char>* buffer_view) const override;
   bool IsRecursiveLayoutDumpRequested() override;
+  void RunPendingAnimations() override;
   std::string DumpLayout(blink::WebLocalFrame* frame) override;
   void DumpPixelsAsync(
       blink::WebView* web_view,
       const base::Callback<void(const SkBitmap&)>& callback) override;
   void ReplicateLayoutTestRuntimeFlagsChanges(
       const base::DictionaryValue& changed_values) override;
   bool HasCustomTextDump(std::string* custom_text_dump) const override;
   bool ShouldDumpBackForwardList() const override;
   blink::WebContentSettingsClient* GetWebContentSettings() const override;
   void InitializeWebViewWithMocks(blink::WebView* web_view) override;
@@ skipping 542 matching lines @@
   bool is_web_platform_tests_mode_;
 
   base::WeakPtrFactory<TestRunner> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TestRunner);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_TEST_RUNNER_H_