cc: Add image to rect map in DiscardableImageMap.

cc/playback/raster_source.cc

 // Copyright 2014 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/playback/raster_source.h"
 
 #include <stddef.h>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
@@ skipping 229 matching lines @@
 }
 
 void RasterSource::GetDiscardableImagesInRect(
     const gfx::Rect& layer_rect,
     float contents_scale,
     std::vector<DrawImage>* images) const {
   DCHECK_EQ(0u, images->size());
   display_list_->GetDiscardableImagesInRect(layer_rect, contents_scale, images);
 }
 
+gfx::Rect RasterSource::GetRectForImage(ImageId image_id) const {
+  return display_list_->GetRectForImage(image_id);
+}
+
 bool RasterSource::CoversRect(const gfx::Rect& layer_rect) const {
   if (size_.IsEmpty())
     return false;
   gfx::Rect bounded_rect = layer_rect;
   bounded_rect.Intersect(gfx::Rect(size_));
   return recorded_viewport_.Contains(bounded_rect);
 }
 
 gfx::Size RasterSource::GetSize() const {
   return size_;
@@ skipping 42 matching lines @@
   bool can_use_lcd_text = false;
   return scoped_refptr<RasterSource>(new RasterSource(this, can_use_lcd_text));
 }
 
 RasterSource::PlaybackSettings::PlaybackSettings()
     : playback_to_shared_canvas(false),
       skip_images(false),
       use_image_hijack_canvas(true) {}
 
 }  // namespace cc