Throttle rendering pipeline for invisible iframes

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 1921 matching lines @@
     double paintStart = currentTime();
     PageWidgetDelegate::paint(*m_page, canvas, rect, *m_page->deprecatedLocalMainFrame());
     double paintEnd = currentTime();
     double pixelsPerSec = (rect.width * rect.height) / (paintEnd - paintStart);
     Platform::current()->histogramCustomCounts("Renderer4.SoftwarePaintDurationMS", (paintEnd - paintStart) * 1000, 0, 120, 30);
     Platform::current()->histogramCustomCounts("Renderer4.SoftwarePaintMegapixPerSecond", pixelsPerSec / 1000000, 10, 210, 30);
 }
 
 void WebViewImpl::didCommitCompositorFrame()
 {
-    // TODO(skyostil): Update the throttling status of all frames in the tree.
+    if (!mainFrameImpl() || !mainFrameImpl()->frameView())
+        return;
+    FrameView* view = mainFrameImpl()->frameView();
+    view->updateThrottling();
 }
 
 #if OS(ANDROID)
 void WebViewImpl::paintCompositedDeprecated(WebCanvas* canvas, const WebRect& rect)
 {
     // Note: This method exists on OS(ANDROID) and will hopefully be
     //       removed once the link disambiguation feature renders using
     //       the compositor.
     ASSERT(isAcceleratedCompositingActive());
 
@@ skipping 2492 matching lines @@
     if (m_pageColorOverlay)
         m_pageColorOverlay->update();
     if (InspectorOverlayImpl* overlay = inspectorOverlay()) {
         PageOverlay* inspectorPageOverlay = overlay->pageOverlay();
         if (inspectorPageOverlay)
             inspectorPageOverlay->update();
     }
 }
 
 } // namespace blink