Android SurfaceViewRenderer: Add resetStatistics() method

Review URL: https://codereview.webrtc.org/1472323003

Cr-Commit-Position: refs/heads/master@{#10833}
diff --git a/talk/app/webrtc/java/android/org/webrtc/SurfaceViewRenderer.java b/talk/app/webrtc/java/android/org/webrtc/SurfaceViewRenderer.java
index 170827e..ed6e8dd 100644
--- a/talk/app/webrtc/java/android/org/webrtc/SurfaceViewRenderer.java
+++ b/talk/app/webrtc/java/android/org/webrtc/SurfaceViewRenderer.java
@@ -243,6 +243,14 @@
       frameRotation = 0;
       rendererEvents = null;
     }
+    resetStatistics();
+  }
+
+  /**
+   * Reset statistics. This will reset the logged statistics in logStatistics(), and
+   * RendererEvents.onFirstFrameRendered() will be called for the next frame.
+   */
+  public void resetStatistics() {
     synchronized (statisticsLock) {
       framesReceived = 0;
       framesDropped = 0;