Add clearImage method to SurfaceViewRenderer.

webrtc/sdk/android/api/org/webrtc/SurfaceViewRenderer.java

Index: webrtc/sdk/android/api/org/webrtc/SurfaceViewRenderer.java
diff --git a/webrtc/sdk/android/api/org/webrtc/SurfaceViewRenderer.java b/webrtc/sdk/android/api/org/webrtc/SurfaceViewRenderer.java
index 9d5fc4806a880a822616bb34d1fd973f3e685a86..866ca59d68b335773ac21095b00d306f07891080 100644
--- a/webrtc/sdk/android/api/org/webrtc/SurfaceViewRenderer.java
+++ b/webrtc/sdk/android/api/org/webrtc/SurfaceViewRenderer.java
@@ -283,6 +283,13 @@ public class SurfaceViewRenderer
     }
   }
 
+  /**
+   * Post a task to clear the SurfaceView to a transparent uniform color.
+   */
+  public void clearImage() {
+    eglRenderer.clearImage();
+  }
+
   // Update frame dimensions and report any changes to |rendererEvents|.
   private void updateFrameDimensionsAndReportEvents(VideoRenderer.I420Frame frame) {
     synchronized (layoutLock) {