Split the implementation of VP8Encoder|Decoder::Create into a seperated file

(vp8_factory.cc).

R=fischman@webrtc.org, marpan@google.com, marpan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/8589004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5606 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/codecs/vp8/vp8.gyp

@@ -31,6 +31,7 @@
         'reference_picture_selection.cc',
         'include/vp8.h',
         'include/vp8_common_types.h',
+        'vp8_factory.cc',
         'vp8_impl.cc',
         'default_temporal_layers.cc',
         'default_temporal_layers.h',

webrtc/modules/video_coding/codecs/vp8/vp8_factory.cc

@@ -0,0 +1,24 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ *
+ */
+
+#include "webrtc/modules/video_coding/codecs/vp8/vp8_impl.h"
+
+namespace webrtc {
+
+VP8Encoder* VP8Encoder::Create() {
+  return new VP8EncoderImpl();
+}
+
+VP8Decoder* VP8Decoder::Create() {
+  return new VP8DecoderImpl();
+}
+
+}  // namespace webrtc

webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc

@@ -35,10 +35,6 @@ enum { kVp8ErrorPropagationTh = 30 };
 
 namespace webrtc {
 
-VP8Encoder* VP8Encoder::Create() {
-  return new VP8EncoderImpl();
-}
-
 VP8EncoderImpl::VP8EncoderImpl()
     : encoded_image_(),
       encoded_complete_callback_(NULL),
@@ -496,10 +492,6 @@ int VP8EncoderImpl::RegisterEncodeCompleteCallback(
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
-VP8Decoder* VP8Decoder::Create() {
-  return new VP8DecoderImpl();
-}
-
 VP8DecoderImpl::VP8DecoderImpl()
     : decode_complete_callback_(NULL),
       inited_(false),