Compositor hit test performance improvement

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 83 matching lines @@
 #include "core/page/FrameView.h"
 #include "core/page/Page.h"
 #include "core/page/PagePopupController.h"
 #include "core/page/PrintContext.h"
 #include "core/page/Settings.h"
 #include "core/page/animation/AnimationController.h"
 #include "core/page/scrolling/ScrollingCoordinator.h"
 #include "core/platform/ColorChooser.h"
 #include "core/platform/Cursor.h"
 #include "core/platform/Language.h"
+#include "core/platform/chromium/TraceEvent.h"
 #include "core/platform/graphics/GraphicsLayer.h"
 #include "core/platform/graphics/IntRect.h"
 #include "core/platform/graphics/filters/FilterOperation.h"
 #include "core/platform/graphics/filters/FilterOperations.h"
 #include "core/platform/graphics/gpu/SharedGraphicsContext3D.h"
 #include "core/platform/mock/PlatformSpeechSynthesizerMock.h"
 #include "core/rendering/RenderLayerBacking.h"
 #include "core/rendering/RenderMenuList.h"
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/RenderTreeAsText.h"
@@ skipping 1199 matching lines @@
     }
 
     // Do any pending layouts to ensure this really takes any previous changes into account.
     document->updateLayout();
 
     return m_touchEventTargetRectUpdateCount;
 }
 
 void Internals::touchEventTargetRectsChanged(const LayerHitTestRects& rects)
 {
+    // When profiling content_shell, it can be handy to exclude this time (since it's only
+    // present for testing / debugging).
+    TRACE_EVENT0("input", "Internals::touchEventTargetRectsChanged");
+
     m_touchEventTargetRectUpdateCount++;
 
     // Since it's not safe to hang onto the pointers in a LayerHitTestRects, we immediately
     // copy into a LayerRectList.
     m_currentTouchEventRects = LayerRectList::create();
     for (LayerHitTestRects::const_iterator iter = rects.begin(); iter != rects.end(); ++iter) {
         for (size_t i = 0; i < iter->value.size(); ++i) {
             m_currentTouchEventRects->append(iter->key->renderer()->node(), ClientRect::create(enclosingIntRect(iter->value[i])));
         }
     }
@@ skipping 742 matching lines @@
         return false;
     sharedContext->getExtensions()->loseContextCHROMIUM(Extensions3D::GUILTY_CONTEXT_RESET_ARB, Extensions3D::INNOCENT_CONTEXT_RESET_ARB);
     // To prevent tests that call loseSharedGraphicsContext3D from being
     // flaky, we call finish so that the context is guaranteed to be lost
     // synchronously (i.e. before returning).
     sharedContext->finish();
     return true;
 }
 
 }