Define AudioBuffer and VideoFrame for mojo

media/base/sample_format.h

Index: media/base/sample_format.h
diff --git a/media/base/sample_format.h b/media/base/sample_format.h
index 7a488433ab8925726b3a6a15cad85b1cb788e6ee..fe6fc50c0ed228f79cf369f93124fb4d97139c94 100644
--- a/media/base/sample_format.h
+++ b/media/base/sample_format.h
@@ -34,6 +34,9 @@ MEDIA_EXPORT int SampleFormatToBytesPerChannel(SampleFormat sample_format);
 // Returns the name of the sample format as a string
 MEDIA_EXPORT const char* SampleFormatToString(SampleFormat sample_format);
 
+// Returns true if |sample_format| is planar, false otherwise.
+MEDIA_EXPORT bool IsPlanar(SampleFormat sample_format);
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_SAMPLE_FORMAT_H