enable video capture to support sharing across multiple renderer processes

content/browser/renderer_host/media/video_capture_controller_event_handler.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/media/video_capture_controller_event_handler.h"
 
 VideoCaptureControllerID::VideoCaptureControllerID(int did)
     : device_id(did) {
 }
 
 bool VideoCaptureControllerID::operator<(
     const VideoCaptureControllerID& vc) const {
   return this->device_id < vc.device_id;
 }
+
+bool VideoCaptureControllerID::operator==(
+    const VideoCaptureControllerID& vc) const {
+  return this->device_id == vc.device_id;
+}