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

cc/layers/picture_image_layer.cc

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/picture_image_layer.h"
 
 #include "cc/layers/picture_image_layer_impl.h"
 #include "cc/playback/display_item_list_settings.h"
 #include "cc/playback/drawing_display_item.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 32 matching lines @@
   // With this check in place we avoid unecessary texture uploads.
   if (image_.get() == image.get())
     return;
 
   image_ = image.Pass();
   UpdateDrawsContent(HasDrawableContent());
   SetNeedsDisplay();
 }
 
 scoped_refptr<DisplayItemList> PictureImageLayer::PaintContentsToDisplayList(
-    const gfx::Rect& clip,
-    ContentLayerClient::PaintingControlSetting painting_control) {
+    ContentLayerClient::PaintingControlSetting painting_control,
+    gfx::Rect* recording_viewport) {
   DCHECK(image_);
   DCHECK_GT(image_->width(), 0);
   DCHECK_GT(image_->height(), 0);
 
   // Picture image layers can be used with GatherPixelRefs, so cached SkPictures
   // are currently required.
   DisplayItemListSettings settings;
   settings.use_cached_picture = true;
   scoped_refptr<DisplayItemList> display_list =
-      DisplayItemList::Create(clip, settings);
+      DisplayItemList::Create(*recording_viewport, settings);
 
   SkPictureRecorder recorder;
-  SkCanvas* canvas = recorder.beginRecording(gfx::RectToSkRect(clip));
+  SkCanvas* canvas =
+      recorder.beginRecording(gfx::RectToSkRect(*recording_viewport));
 
   SkScalar content_to_layer_scale_x =
       SkFloatToScalar(static_cast<float>(bounds().width()) / image_->width());
   SkScalar content_to_layer_scale_y =
       SkFloatToScalar(static_cast<float>(bounds().height()) / image_->height());
   canvas->scale(content_to_layer_scale_x, content_to_layer_scale_y);
 
   // Because Android WebView resourceless software draw mode rasters directly
   // to the root canvas, this draw must use the kSrcOver_Mode so that
   // transparent images blend correctly.
@@ skipping 10 matching lines @@
 
 bool PictureImageLayer::FillsBoundsCompletely() const {
   return false;
 }
 
 size_t PictureImageLayer::GetApproximateUnsharedMemoryUsage() const {
   return 0;
 }
 
 }  // namespace cc