Reland "Use injectable hardware video decoder/encoder in AppRTCMobile."

This is a reland of 0cbaf1a6f6ad13a25993f6ea3be931894a196834
Original change's description:
> Use injectable hardware video decoder/encoder in AppRTCMobile.
> 
> Also include a small fix for getting the encoder queue.
> 
> Bug: webrtc:7760
> Change-Id: I96dc8ffb363b90382276d88148f81d5f89dca5f2
> Reviewed-on: https://webrtc-review.googlesource.com/2683
> Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
> Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#20022}

Bug: webrtc:7760
Change-Id: Ia82129fde7abb59120ba5bb23938db9eb576ae91
Reviewed-on: https://webrtc-review.googlesource.com/4701
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20080}
diff --git a/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java b/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
index caad171..44278ff 100644
--- a/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
+++ b/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
@@ -36,6 +36,8 @@
 import org.webrtc.CameraVideoCapturer;
 import org.webrtc.DataChannel;
 import org.webrtc.EglBase;
+import org.webrtc.HardwareVideoDecoderFactory;
+import org.webrtc.HardwareVideoEncoderFactory;
 import org.webrtc.IceCandidate;
 import org.webrtc.Logging;
 import org.webrtc.MediaConstraints;
@@ -339,6 +341,7 @@
     createPeerConnection(
         localRender, Collections.singletonList(remoteRender), videoCapturer, signalingParameters);
   }
+
   public void createPeerConnection(final VideoSink localRender,
       final List<VideoRenderer.Callbacks> remoteRenders, final VideoCapturer videoCapturer,
       final SignalingParameters signalingParameters) {
@@ -512,7 +515,12 @@
     if (options != null) {
       Log.d(TAG, "Factory networkIgnoreMask option: " + options.networkIgnoreMask);
     }
-    factory = new PeerConnectionFactory(options);
+    final boolean enableH264HighProfile =
+        peerConnectionParameters.videoCodec.equals(VIDEO_CODEC_H264_HIGH);
+    factory = new PeerConnectionFactory(options,
+        new HardwareVideoEncoderFactory(rootEglBase.getEglBaseContext(),
+            true /* enableIntelVp8Encoder */, enableH264HighProfile),
+        new HardwareVideoDecoderFactory(rootEglBase.getEglBaseContext()));
     Log.d(TAG, "Peer connection factory created.");
   }