Improve logging output for DecoderBuffer and VideoFrame

media/base/video_frame.h

Index: media/base/video_frame.h
diff --git a/media/base/video_frame.h b/media/base/video_frame.h
index 67f14177693c3e9ce799f10364bcc6fe495a34e4..8e69877a03fa8699483ab4857dfd299c76999548 100644
--- a/media/base/video_frame.h
+++ b/media/base/video_frame.h
@@ -5,6 +5,7 @@
 #ifndef MEDIA_BASE_VIDEO_FRAME_H_
 #define MEDIA_BASE_VIDEO_FRAME_H_
 
+#include <string>
 #include <vector>
 
 #include "base/callback.h"
@@ -405,6 +406,9 @@ class MEDIA_EXPORT VideoFrame : public base::RefCountedThreadSafe<VideoFrame> {
   // 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();
+
  private:
   friend class base::RefCountedThreadSafe<VideoFrame>;