Convert USE(NATIVE_FULLSCREEN_VIDEO) to a runtime enabled feature

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright (c) 2012 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 913 matching lines @@
     switches::kEnableDeferredImageDecoding,
     switches::kEnableGPUServiceLogging,
     switches::kEnableGPUClientLogging,
     switches::kEnableGpuClientTracing,
     switches::kEnableGpuBenchmarking,
 #if defined(OS_WIN)
     switches::kEnableHighResolutionTime,
 #endif
     switches::kEnableMP3StreamParser,
     switches::kEnableMemoryBenchmarking,
+    switches::kEnableOverlayFullscreenVideo,
     switches::kEnableOverlayScrollbars,
     switches::kEnableSkiaBenchmarking,
     switches::kEnableLogging,
     switches::kEnableSpeechSynthesis,
     switches::kEnableTouchDragDrop,
     switches::kEnableTouchEditing,
 #if defined(ENABLE_WEBRTC)
     switches::kEnableWebRtcAecRecordings,
     switches::kEnableWebRtcTcpServerSocket,
 #endif
@@ skipping 854 matching lines @@
     // Skip widgets in other processes.
     if (widget->GetProcess()->GetID() != GetID())
       continue;
 
     RenderViewHost* rvh = RenderViewHost::From(widget);
     rvh->UpdateWebkitPreferences(rvh->GetWebkitPreferences());
   }
 }
 
 }  // namespace content