VideoCapturerAndroid: Ignore erroneous startCaptureOnCameraThread calls instead of crashing

webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java

Index: webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java
diff --git a/webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java b/webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java
index 39ed12cfa3d2708c9b0ee74c3724a0d707154ad7..484cf66d4cc5e69b854c75a9e9b7e3b35ebfe1e6 100644
--- a/webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java
+++ b/webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java
@@ -410,7 +410,8 @@ public class VideoCapturerAndroid implements
     Throwable error = null;
     checkIsOnCameraThread();
     if (camera != null) {
-      throw new RuntimeException("Camera has already been started.");
+      Logging.e(TAG, "startCaptureOnCameraThread: Camera has already been started.");

[AlexG, 2016/05/11 17:23:50]

Worth also to call onCameraError? 

[magjed_webrtc, 2016/05/12 09:44:24]

I don't think so, because the camera should be running successfully at this
point.

+      return;
     }
     this.applicationContext = applicationContext;
     this.frameObserver = frameObserver;