Disable scrolling for fullscreen elements by changing scroll layer size.

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 5674 matching lines @@
     webViewImpl->resize(WebSize(viewportWidth, viewportHeight));
     webViewImpl->layout();
 
     Document* document = toWebLocalFrameImpl(webViewImpl->mainFrame())->frame()->document();
     UserGestureIndicator gesture(DefinitelyProcessingUserGesture);
     Element* divFullscreen = document->getElementById("div1");
     Fullscreen::from(*document).requestFullscreen(*divFullscreen, Fullscreen::PrefixedRequest);
     webViewImpl->didEnterFullScreen();
     webViewImpl->layout();
 
-    // Verify that the main frame is not scrollable.
+    // Verify that the main frame bounds are empty.
     ASSERT_TRUE(Fullscreen::isFullScreen(*document));
     WebLayer* webScrollLayer = webViewImpl->compositor()->scrollLayer()->platformLayer();
-    ASSERT_FALSE(webScrollLayer->scrollable());
+    ASSERT_EQ(WebSize(), webScrollLayer->bounds());
 
     // Verify that the main frame is scrollable upon exiting fullscreen.
     webViewImpl->didExitFullScreen();
     webViewImpl->layout();
     ASSERT_FALSE(Fullscreen::isFullScreen(*document));
     webScrollLayer = webViewImpl->compositor()->scrollLayer()->platformLayer();
-    ASSERT_TRUE(webScrollLayer->scrollable());
+    ASSERT_NE(WebSize(), webScrollLayer->bounds());
 }
 
 TEST_F(WebFrameTest, FullscreenMainFrameScrollable)
 {
     FakeCompositingWebViewClient client;
     registerMockedHttpURLLoad("fullscreen_div.html");
     FrameTestHelpers::WebViewHelper webViewHelper;
     int viewportWidth = 640;
     int viewportHeight = 480;
     WebViewImpl* webViewImpl = webViewHelper.initializeAndLoad(m_baseURL + "fullscreen_div.html", true, 0, &client, &configueCompositingWebView);
@@ skipping 457 matching lines @@
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 
     // Neither should a page reload.
     localFrame->reload();
     EXPECT_EQ(4u, frameClient.provisionalLoadCount());
     EXPECT_FALSE(frameClient.wasLastProvisionalLoadATransition());
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 }
 
 } // namespace