Test that main thread frames cease to fire during composited animation

content/browser/webkit_browsertest.cc

 // Copyright (c) 2012 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 "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "content/test/net/url_request_abort_on_end_job.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 namespace content {
 
 typedef ContentBrowserTest WebKitBrowserTest;
 
@@ skipping 51 matching lines @@
 const char kPrerenderNoCrashPage[] = "/prerender/prerender-no-crash.html";
 IN_PROC_BROWSER_TEST_F(WebKitBrowserTest, PrerenderNoCrash) {
   ASSERT_TRUE(embedded_test_server()->Start());
   GURL url = embedded_test_server()->GetURL(kPrerenderNoCrashPage);
 
   NavigateToURL(shell(), url);
 
   EXPECT_FALSE(shell()->web_contents()->IsCrashed());
 }
 
+const char kTransformAnimationPage[] = "/transform-animation.html";
+IN_PROC_BROWSER_TEST_F(WebKitBrowserTest, TransformAnimationMainThreadFrames) {
+  ASSERT_TRUE(embedded_test_server()->Start());
+  URLRequestAbortOnEndJob::AddUrlHandler();
+  GURL url = embedded_test_server()->GetURL(kTransformAnimationPage);
+
+  NavigateToURL(shell(), url);
+
+  WebContents* web_contents = shell()->web_contents();
+  FrameWatcher frame_watcher(web_contents);
+  frame_watcher.WaitFrames(3);
+  ASSERT_FALSE(frame_watcher.LastMetadata().is_main_thread_frame);
+}
+
 }  // namespace content