Support VP9 HW video decoding on Android.

talk/app/webrtc/java/jni/androidmediacodeccommon.h

Index: talk/app/webrtc/java/jni/androidmediacodeccommon.h
diff --git a/talk/app/webrtc/java/jni/androidmediacodeccommon.h b/talk/app/webrtc/java/jni/androidmediacodeccommon.h
index 348a716496560b04daa02fad3271201b1f0c089b..92ea135f120a78f637641aa778e49f01b9e462f2 100644
--- a/talk/app/webrtc/java/jni/androidmediacodeccommon.h
+++ b/talk/app/webrtc/java/jni/androidmediacodeccommon.h
@@ -72,6 +72,8 @@ enum { kMediaCodecTimeoutMs = 1000 };
 enum { kMediaCodecStatisticsIntervalMs = 3000 };
 // Maximum amount of pending frames for VP8 decoder.
 enum { kMaxPendingFramesVp8 = 1 };
+// Maximum amount of pending frames for VP9 decoder.
+enum { kMaxPendingFramesVp9 = 1 };
 // Maximum amount of pending frames for H.264 decoder.
 enum { kMaxPendingFramesH264 = 30 };
 // Maximum amount of decoded frames for which per-frame logging is enabled.