Add onCameraDisconnected camera event.

webrtc/api/android/java/src/org/webrtc/CameraVideoCapturer.java

Index: webrtc/api/android/java/src/org/webrtc/CameraVideoCapturer.java
diff --git a/webrtc/api/android/java/src/org/webrtc/CameraVideoCapturer.java b/webrtc/api/android/java/src/org/webrtc/CameraVideoCapturer.java
index 1a66fcc37b413827ca2a2927cee468bcda6c4436..283d5d1f2bd55609f461dea4ac124fa4449bfb77 100644
--- a/webrtc/api/android/java/src/org/webrtc/CameraVideoCapturer.java
+++ b/webrtc/api/android/java/src/org/webrtc/CameraVideoCapturer.java
@@ -25,6 +25,9 @@ public interface CameraVideoCapturer extends VideoCapturer {
     // or any camera exception happens on camera thread.
     void onCameraError(String errorDescription);
 
+    // Called when camera is disconnected.
+    void onCameraDisconnected();
+
     // Invoked when camera stops receiving frames.
     void onCameraFreezed(String errorDescription);