[tracing] Implement composable memory usage estimators.

ui/android/resources/crushed_sprite_resource.h

 // Copyright 2015 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.
 
 #ifndef UI_ANDROID_RESOURCES_CRUSHED_SPRITE_RESOURCE_H_
 #define UI_ANDROID_RESOURCES_CRUSHED_SPRITE_RESOURCE_H_
 
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 53 matching lines @@
   // Returns the unscaled size of an individual sprite.
   gfx::Size GetUnscaledSpriteSize();
 
   // Returns the scaled size of an individual sprite.
   gfx::Size GetScaledSpriteSize();
 
   // Returns the total number of frames in the sprite animation.
   int GetFrameCount();
 
   // Returns the memory usage of the bitmap.
-  size_t GetAllocatedSizeInBytes() const;
+  size_t EstimateMemoryUsage() const;
 
  private:
   SkBitmap bitmap_;
   SrcDstRects src_dst_rects_;
   gfx::Size unscaled_sprite_size_;
   gfx::Size scaled_sprite_size_;
 
   DISALLOW_COPY_AND_ASSIGN(CrushedSpriteResource);
 };
 
 }  // namespace ui
 
 #endif  // UI_ANDROID_RESOURCES_CRUSHED_SPRITE_RESOURCE_H_