Create a hardware VideoDecoder implementation using Android MediaCodec.

BUG=webrtc:7760

Change-Id: Ieae3852d22cadf24cf4184ae985062918a85f02c
Reviewed-on: https://chromium-review.googlesource.com/536237
Commit-Queue: Bjorn Mellem <mellem@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18685}

webrtc/sdk/android/api/org/webrtc/VideoDecoder.java

@@ -18,9 +18,13 @@ public interface VideoDecoder {
   /** Settings passed to the decoder by WebRTC. */
   public class Settings {
     public final int numberOfCores;
+    public final int width;
+    public final int height;
 
-    public Settings(int numberOfCores) {
+    public Settings(int numberOfCores, int width, int height) {
       this.numberOfCores = numberOfCores;
+      this.width = width;
+      this.height = height;
     }
   }
 
@@ -50,15 +54,15 @@ public interface VideoDecoder {
    * Initializes the decoding process with specified settings. Will be called on the decoding thread
    * before any decode calls.
    */
-  void initDecode(Settings settings, Callback decodeCallback);
+  VideoCodecStatus initDecode(Settings settings, Callback decodeCallback);
   /**
    * Called when the decoder is no longer needed. Any more calls to decode will not be made.
    */
-  void release();
+  VideoCodecStatus release();
   /**
    * Request the decoder to decode a frame.
    */
-  void decode(EncodedImage frame, DecodeInfo info);
+  VideoCodecStatus decode(EncodedImage frame, DecodeInfo info);
   /**
    * The decoder should return true if it prefers late decoding. That is, it can not decode
    * infinite number of frames before the decoded frame is consumed.