Add Create() function to AudioCodecBridge and VideoCodecBridge to allow return of null pointers

media/base/android/media_codec_bridge.h

Index: media/base/android/media_codec_bridge.h
diff --git a/media/base/android/media_codec_bridge.h b/media/base/android/media_codec_bridge.h
index b1f779edcc4cb0e02e73c13e1065ed0f9977e081..d1531c6aebc0eaf94ae9ac6c03bef20dc159aa9a 100644
--- a/media/base/android/media_codec_bridge.h
+++ b/media/base/android/media_codec_bridge.h
@@ -114,21 +114,26 @@ class MediaCodecBridge {
 
 class AudioCodecBridge : public MediaCodecBridge {
  public:
-  explicit AudioCodecBridge(const AudioCodec codec);
+  static AudioCodecBridge* Create(const AudioCodec codec);
 
   // Start the audio codec bridge.
   bool Start(const AudioCodec codec, int sample_rate, int channel_count,
              const uint8* extra_data, size_t extra_data_size);
+ private:
+  explicit AudioCodecBridge(const char* mime);
 };
 
 class VideoCodecBridge : public MediaCodecBridge {
  public:
-  explicit VideoCodecBridge(const VideoCodec codec);
+  static VideoCodecBridge* Create(const VideoCodec codec);
 
   // Start the video codec bridge.
   // TODO(qinmin): Pass codec specific data if available.
   bool Start(
       const VideoCodec codec, const gfx::Size& size, jobject surface);
+
+ private:
+  explicit VideoCodecBridge(const char* mime);
 };
 
 }  // namespace media