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

third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.cpp

Index: third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.cpp b/third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.cpp
index cbf0c830bacec21ad6b48843a1003340ee00b807..c7112b4cca5273d274c9a29820b165e7385ab3b1 100644
--- a/third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.cpp
@@ -41,6 +41,7 @@
 #include "public/platform/WebRect.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPicture.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace blink {
 
@@ -81,6 +82,13 @@ static void paintArtifactToWebDisplayItemList(WebDisplayItemList* list, const Pa
     artifact.appendToWebDisplayItemList(list);
 }
 
+gfx::Rect ContentLayerDelegate::paintableRegion()
+{
+//    fprintf(stderr, "ContentLayerDelegate::paintableRegion\n");

[enne (OOO), 2015/11/18 22:39:50]

<_<

[chrishtr, 2015/11/18 22:41:06]

Done.

+    IntRect interestRect = m_painter->interestRect();
+    return gfx::Rect(interestRect.x(), interestRect.y(), interestRect.width(), interestRect.height());
+}
+
 void ContentLayerDelegate::paintContents(
     WebDisplayItemList* webDisplayItemList, const WebRect& clip,
     WebContentLayerClient::PaintingControlSetting paintingControl)