Fix N7 camera aspect ratio.

N7 video preview generates stretched output:
https://code.google.com/p/android/issues/detail?id=70830.
To workaround the problem set camera picture size in
addition to video preview size with the same resolution.

BUG=3971
R=braveyao@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/25009004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7581 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_capture/android/java/src/org/webrtc/videoengine/VideoCaptureAndroid.java

@@ -172,6 +172,7 @@ public class VideoCaptureAndroid implements PreviewCallback, Callback {
       if (parameters.isVideoStabilizationSupported()) {
         parameters.setVideoStabilization(true);
       }
+      parameters.setPictureSize(width, height);
       parameters.setPreviewSize(width, height);
 
       // Check if requested fps range is supported by camera,