Added BitsPerChannel method to video frame class.

media/base/video_frame.cc

Index: media/base/video_frame.cc
diff --git a/media/base/video_frame.cc b/media/base/video_frame.cc
index d2808356111d86c56b19644a2f6a51d602c4ca2b..7ff020f687205baf49d344a9ef5b93d1c9320c48 100644
--- a/media/base/video_frame.cc
+++ b/media/base/video_frame.cc
@@ -795,6 +795,53 @@ std::string VideoFrame::AsHumanReadableString() {
   return s.str();
 }
 
+int VideoFrame::BitsPerChannel(VideoPixelFormat format) {
+  int bits_per_channel = 0;
+  switch (format) {
+    case media::PIXEL_FORMAT_UNKNOWN:
+      NOTREACHED();
+    // Fall through!
+    case media::PIXEL_FORMAT_I420:
+    case media::PIXEL_FORMAT_YV12:
+    case media::PIXEL_FORMAT_YV16:
+    case media::PIXEL_FORMAT_YV12A:
+    case media::PIXEL_FORMAT_YV24:
+    case media::PIXEL_FORMAT_NV12:
+    case media::PIXEL_FORMAT_NV21:
+    case media::PIXEL_FORMAT_UYVY:
+    case media::PIXEL_FORMAT_YUY2:
+    case media::PIXEL_FORMAT_ARGB:
+    case media::PIXEL_FORMAT_XRGB:
+    case media::PIXEL_FORMAT_RGB24:
+    case media::PIXEL_FORMAT_RGB32:
+    case media::PIXEL_FORMAT_MJPEG:
+    case media::PIXEL_FORMAT_MT21:
+    case media::PIXEL_FORMAT_Y8:
+    case media::PIXEL_FORMAT_I422:
+      bits_per_channel = 8;
+      break;
+    case media::PIXEL_FORMAT_YUV420P9:
+    case media::PIXEL_FORMAT_YUV422P9:
+    case media::PIXEL_FORMAT_YUV444P9:
+      bits_per_channel = 9;
+      break;
+    case media::PIXEL_FORMAT_YUV420P10:
+    case media::PIXEL_FORMAT_YUV422P10:
+    case media::PIXEL_FORMAT_YUV444P10:
+      bits_per_channel = 10;
+      break;
+    case media::PIXEL_FORMAT_YUV420P12:
+    case media::PIXEL_FORMAT_YUV422P12:
+    case media::PIXEL_FORMAT_YUV444P12:
+      bits_per_channel = 12;
+      break;
+    case media::PIXEL_FORMAT_Y16:
+      bits_per_channel = 16;
+      break;
+  }
+  return bits_per_channel;
+}
+
 // static
 scoped_refptr<VideoFrame> VideoFrame::WrapExternalStorage(
     VideoPixelFormat format,