Added BitsPerChannel method to video frame class.

media/base/video_frame.h

 // Copyright (c) 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.
 
 #ifndef MEDIA_BASE_VIDEO_FRAME_H_
 #define MEDIA_BASE_VIDEO_FRAME_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 375 matching lines @@
   // This method is thread safe. Both blink and compositor threads can call it.
   void UpdateReleaseSyncToken(SyncTokenClient* client);
 
   // Returns a human-readable string describing |*this|.
   std::string AsHumanReadableString();
 
   // Unique identifier for this video frame; generated at construction time and
   // guaranteed to be unique within a single process.
   int unique_id() const { return unique_id_; }
 
+  // Returns the number of bits per channel for given |format|.
+  int BitsPerChannel(VideoPixelFormat format);
+
  protected:
   friend class base::RefCountedThreadSafe<VideoFrame>;
 
   // Clients must use the static factory/wrapping methods to create a new frame.
   // Derived classes should create their own factory/wrapping methods, and use
   // this constructor to do basic initialization.
   VideoFrame(VideoPixelFormat format,
              StorageType storage_type,
              const gfx::Size& coded_size,
              const gfx::Rect& visible_rect,
@@ skipping 136 matching lines @@
   const int unique_id_;
 
   gfx::ColorSpace color_space_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoFrame);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_FRAME_H_