Android focus problem on rear camera.

talk/app/webrtc/java/android/org/webrtc/VideoCapturerAndroid.java

Index: talk/app/webrtc/java/android/org/webrtc/VideoCapturerAndroid.java
diff --git a/talk/app/webrtc/java/android/org/webrtc/VideoCapturerAndroid.java b/talk/app/webrtc/java/android/org/webrtc/VideoCapturerAndroid.java
index aeb5418f75451c571a87fe1a4ffd7c094a8ccd35..8ae108be599cafd96e35735437eb29748b5b2d1e 100644
--- a/talk/app/webrtc/java/android/org/webrtc/VideoCapturerAndroid.java
+++ b/talk/app/webrtc/java/android/org/webrtc/VideoCapturerAndroid.java
@@ -414,6 +414,12 @@ public class VideoCapturerAndroid extends VideoCapturer implements PreviewCallba
     // (Re)start preview.
     Log.d(TAG, "Start capturing: " + captureFormat);
     this.captureFormat = captureFormat;
+
+    List<String> focusModes = parameters.getSupportedFocusModes();
+    if (focusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO)) {
+      parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
+    }
+
     camera.setParameters(parameters);
     videoBuffers.queueCameraBuffers(captureFormat.frameSize(), camera);
     camera.setPreviewCallbackWithBuffer(this);