Media Controls: make the MediaControlsOverlayPlayButton a runtime enabled flag.

chromecast/renderer/cast_content_renderer_client.cc

 // 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.
 
 #include "chromecast/renderer/cast_content_renderer_client.h"
 
 #include <stdint.h>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 80 matching lines @@
     base::debug::SetCrashKeyValue(crash_keys::kPreviousApp, previous_app);
 }
 
 void CastContentRendererClient::RenderViewCreated(
     content::RenderView* render_view) {
   blink::WebView* webview = render_view->GetWebView();
   if (webview) {
     blink::WebFrameWidget* web_frame_widget = render_view->GetWebFrameWidget();
     web_frame_widget->setBaseBackgroundColor(kColorBlack);
 
-    // Settings for ATV (Android defaults are not what we want):
-    webview->settings()->setMediaControlsOverlayPlayButtonEnabled(false);
-
     // Disable application cache as Chromecast doesn't support off-line
     // application running.
     webview->settings()->setOfflineWebApplicationCacheEnabled(false);
   }
 }
 
 void CastContentRendererClient::AddSupportedKeySystems(
     std::vector<std::unique_ptr<::media::KeySystemProperties>>*
         key_systems_properties) {
   AddChromecastKeySystems(key_systems_properties,
@@ skipping 27 matching lines @@
   }
 
   // Lifetime is tied to |render_frame| via content::RenderFrameObserver.
   new CastRenderFrameActionDeferrer(render_frame, closure);
 }
 
 bool CastContentRendererClient::AllowMediaSuspend() {
   return false;
 }
 
+void CastContentRendererClient::
+    SetRuntimeFeaturesDefaultsBeforeBlinkInitialization() {
+  // Settings for ATV (Android defaults are not what we want).
+  WebRuntimeFeatures::enableMediaControlsOverlayPlayButton(false);

[halliwell, 2017/03/03 15:26:29]

do you need to include a header for WebRuntimeFeatures?

+}
+
 }  // namespace shell
 }  // namespace chromecast