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

cc/blink/web_content_layer_impl.cc

Index: cc/blink/web_content_layer_impl.cc
diff --git a/cc/blink/web_content_layer_impl.cc b/cc/blink/web_content_layer_impl.cc
index 2990978df6f91ebea23efdae83beea7f603a2278..9ac5981a4439a264d9048650ffeaa73c19a338e7 100644
--- a/cc/blink/web_content_layer_impl.cc
+++ b/cc/blink/web_content_layer_impl.cc
@@ -60,16 +60,17 @@ blink::WebLayer* WebContentLayerImpl::layer() {
 
 scoped_refptr<cc::DisplayItemList>
 WebContentLayerImpl::PaintContentsToDisplayList(
-    const gfx::Rect& clip,
-    cc::ContentLayerClient::PaintingControlSetting painting_control) {
+    cc::ContentLayerClient::PaintingControlSetting painting_control,
+    gfx::Rect* recorded_viewport) {
   cc::DisplayItemListSettings settings;
   settings.use_cached_picture = UseCachedPictureRaster();
 
   scoped_refptr<cc::DisplayItemList> display_list =
-      cc::DisplayItemList::Create(clip, settings);
+      cc::DisplayItemList::Create(*recorded_viewport, settings);
   if (client_) {
     WebDisplayItemListImpl list(display_list.get());
-    client_->paintContents(&list, clip, PaintingControlToWeb(painting_control));
+    client_->paintContents(&list, recorded_viewport,
+                           PaintingControlToWeb(painting_control));
   }
   display_list->Finalize();
   return display_list;