Turn off computation of the interest rect in cc in synchronized paint mode.

third_party/WebKit/Source/web/LinkHighlightImpl.cpp

Index: third_party/WebKit/Source/web/LinkHighlightImpl.cpp
diff --git a/third_party/WebKit/Source/web/LinkHighlightImpl.cpp b/third_party/WebKit/Source/web/LinkHighlightImpl.cpp
index ce39f38634e0b32f3f239b45f5852dadee362d0e..8daaf6848664c80f88824b9ea71532ecbf89229c 100644
--- a/third_party/WebKit/Source/web/LinkHighlightImpl.cpp
+++ b/third_party/WebKit/Source/web/LinkHighlightImpl.cpp
@@ -53,6 +53,7 @@
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 #include "third_party/skia/include/utils/SkMatrix44.h"
+#include "ui/gfx/geometry/rect.h"

[enne (OOO), 2015/11/18 21:31:58]

Is this legit to include from here?

 #include "web/WebLocalFrameImpl.h"
 #include "web/WebSettingsImpl.h"
 #include "web/WebViewImpl.h"
@@ -260,6 +261,11 @@ bool LinkHighlightImpl::computeHighlightLayerPathAndPosition(const LayoutBoxMode
     return pathHasChanged;
 }
 
+gfx::Rect LinkHighlightImpl::paintableRegion()
+{
+    return gfx::Rect(0, 0, contentLayer()->layer()->bounds().width, contentLayer()->layer()->bounds().height);
+}
+
 void LinkHighlightImpl::paintContents(WebDisplayItemList* webDisplayItemList, const WebRect& webClipRect, WebContentLayerClient::PaintingControlSetting paintingControl)
 {
     if (!m_node || !m_node->layoutObject())