Remove Exynos from MediaCodec blacklist. Limit MediaTek blacklist.

media/base/android/media_codec_util.h

 // Copyright 2015 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_UTIL_H_
 #define MEDIA_BASE_ANDROID_MEDIA_CODEC_UTIL_H_
 
 #include <jni.h>
 #include <set>
 #include <string>
@@ skipping 48 matching lines @@
 
   // Test whether the path of a URL ends with ".m3u8".
   static bool IsHLSURL(const GURL& url);
 
   // Test whether a URL contains "m3u8". (Using exactly the same logic as
   // NuPlayer does to determine if a stream is HLS.)
   static bool IsHLSPath(const GURL& url);
 
   static bool RegisterMediaCodecUtil(JNIEnv* env);
 
-  // Indicates if the vp8 decoder is available on this device.
+  // Indicates if the vp8 decoder or encoder is available on this device.
   static bool IsVp8DecoderAvailable();
+  static bool IsVp8EncoderAvailable();
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_CODEC_UTIL_H_