VideoCapturerAndroid: Report onFirstFrameAvailable() for textures as well

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

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 665 matching lines @@
   @Override
   public void onTextureFrameAvailable(
       int oesTextureId, float[] transformMatrix, long timestampNs) {
     checkIsOnCameraThread();
     if (camera == null) {
       // Camera is stopped, we need to return the buffer immediately.
       surfaceHelper.returnTextureFrame();
       return;
     }
     if (dropNextFrame)  {
-     surfaceHelper.returnTextureFrame();
-     dropNextFrame = false;
-     return;
+      surfaceHelper.returnTextureFrame();
+      dropNextFrame = false;
+      return;
+    }
+    if (eventsHandler != null && !firstFrameReported) {
+      eventsHandler.onFirstFrameAvailable();
+      firstFrameReported = true;
     }
 
     int rotation = getFrameOrientation();
     if (info.facing == android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT) {
       // Undo the mirror that the OS "helps" us with.
       // http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)
       transformMatrix =
           RendererCommon.multiplyMatrices(transformMatrix, RendererCommon.horizontalFlipMatrix());
     }
     cameraStatistics.addFrame();
     frameObserver.onTextureFrameCaptured(captureFormat.width, captureFormat.height, oesTextureId,
         transformMatrix, rotation, timestampNs);
   }
 }