Add resetOnFirstFrameRendered method to SurfaceViewRenderer.

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

Index: webrtc/api/android/java/src/org/webrtc/SurfaceViewRenderer.java
diff --git a/webrtc/api/android/java/src/org/webrtc/SurfaceViewRenderer.java b/webrtc/api/android/java/src/org/webrtc/SurfaceViewRenderer.java
index 154b6ad75dbfc8e5c45f053acfe3e993a6676439..219f6cf4a80df721da21936f2a8ff6823d3e1106 100644
--- a/webrtc/api/android/java/src/org/webrtc/SurfaceViewRenderer.java
+++ b/webrtc/api/android/java/src/org/webrtc/SurfaceViewRenderer.java
@@ -117,6 +117,17 @@ public class SurfaceViewRenderer
   }
 
   /**
+   * Calling this function will trigger a RendererEvents.onFirstFrameRendered() callback for the
+   * next frame.
+   */
+  public void resetOnFirstFrameRendered() {
+    logD("resetOnFirstFrameRendered");
+    synchronized (layoutLock) {
+      isFirstFrameRendered = false;
+    }
+  }
+
+  /**
    * Enables fixed size for the surface. This provides better performance but might be buggy on some
    * devices. By default this is turned off.
    */