Tab/Desktop capture: Fix for super-old frame after resume.

media/capture/content/screen_capture_device_core.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_CAPTURE_CONTENT_SCREEN_CAPTURE_DEVICE_CORE_H_
 #define MEDIA_CAPTURE_CONTENT_SCREEN_CAPTURE_DEVICE_CORE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 104 matching lines @@
   // Tracks the CaptureMachine that's doing work on our behalf
   // on the device thread or UI thread.
   // This value should never be dereferenced by this class.
   std::unique_ptr<VideoCaptureMachine> capture_machine_;
 
   // Our thread-safe capture oracle which serves as the gateway to the video
   // capture pipeline. Besides the VideoCaptureDevice itself, it is the only
   // component of the system with direct access to |client_|.
   scoped_refptr<ThreadSafeCaptureOracle> oracle_proxy_;
 
+  // After Resume(), some unknown amount of time has passed, and the content of
+  // the capture source may have changed. This flag is used to ensure that the
+  // passive refresh mechanism is not used for the first refresh frame following
+  // a Resume().
+  bool force_active_refresh_once_;
+
   DISALLOW_COPY_AND_ASSIGN(ScreenCaptureDeviceCore);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_CONTENT_SCREEN_CAPTURE_DEVICE_CORE_H_