Add onCameraDisconnected camera event.

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

Index: webrtc/api/android/java/src/org/webrtc/CameraCapturer.java
diff --git a/webrtc/api/android/java/src/org/webrtc/CameraCapturer.java b/webrtc/api/android/java/src/org/webrtc/CameraCapturer.java
index c94538bf740a256c4b60b8c51d8b91942b1a9cf3..86f5f217c1cd3dd19a8ada9bfea469e0c62d06de 100644
--- a/webrtc/api/android/java/src/org/webrtc/CameraCapturer.java
+++ b/webrtc/api/android/java/src/org/webrtc/CameraCapturer.java
@@ -119,6 +119,19 @@ public abstract class CameraCapturer implements CameraVideoCapturer {
     }
 
     @Override
+    public void onCameraDisconnected(CameraSession session) {
+      checkIsOnCameraThread();
+      synchronized (stateLock) {
+        if (session != currentSession) {
+          Logging.w(TAG, "onCameraDisconnected from another session.");
+          return;
+        }
+        eventsHandler.onCameraDisconnected();
+        stopCapture();
+      }
+    }
+
+    @Override
     public void onCameraClosed(CameraSession session) {
       checkIsOnCameraThread();
       synchronized (stateLock) {
@@ -204,6 +217,8 @@ public abstract class CameraCapturer implements CameraVideoCapturer {
         @Override
         public void onCameraError(String errorDescription) {}
         @Override
+        public void onCameraDisconnected() {}
+        @Override
         public void onCameraFreezed(String errorDescription) {}
         @Override
         public void onCameraOpening(String cameraName) {}