Add flag to beginRecording to request saveLayer information

cc/resources/picture.cc

 // Copyright 2012 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/resources/picture.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 
@@ skipping 197 matching lines @@
                recording_mode);
 
   DCHECK(!picture_);
   DCHECK(!tile_grid_info.fTileInterval.isEmpty());
 
   SkTileGridFactory factory(tile_grid_info);
   SkPictureRecorder recorder;
 
   skia::RefPtr<SkCanvas> canvas;
   canvas = skia::SharePtr(recorder.beginRecording(
-      layer_rect_.width(), layer_rect_.height(), &factory));
+      layer_rect_.width(), layer_rect_.height(), &factory,
+      SkPictureRecorder::kComputeSaveLayerInfo_RecordFlag));
 
   ContentLayerClient::GraphicsContextStatus graphics_context_status =
       ContentLayerClient::GRAPHICS_CONTEXT_ENABLED;
 
   switch (recording_mode) {
     case RECORD_NORMALLY:
       // Already setup for normal recording.
       break;
     case RECORD_WITH_SK_NULL_CANVAS:
       canvas = skia::AdoptRef(SkCreateNullCanvas());
@@ skipping 282 matching lines @@
   scoped_refptr<base::debug::TracedValue> record_data =
       new base::debug::TracedValue();
   TracedValue::SetIDRef(this, record_data.get(), "picture_id");
   record_data->BeginArray("layer_rect");
   MathUtil::AddToTracedValue(layer_rect_, record_data.get());
   record_data->EndArray();
   return record_data;
 }
 
 }  // namespace cc