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

media/base/android/media_codec_bridge.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_ANDROID_MEDIA_CODEC_BRIDGE_H_
 #define MEDIA_BASE_ANDROID_MEDIA_CODEC_BRIDGE_H_
 
 #include <jni.h>
 #include <string>
 
@@ skipping 96 matching lines @@
   base::android::ScopedJavaGlobalRef<jobjectArray> j_input_buffers_;
 
   // Output buffers used for *InputBuffer() methods.
   base::android::ScopedJavaGlobalRef<jobjectArray> j_output_buffers_;
 
   DISALLOW_COPY_AND_ASSIGN(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
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_CODEC_BRIDGE_H_