Enable new media playback UI for clank.

content/renderer/render_view_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.
 
 #include "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 1145 matching lines @@
   settings->setViewportMetaNonUserScalableQuirk(
       prefs.viewport_meta_non_user_scalable_quirk);
   settings->setViewportMetaZeroValuesQuirk(
       prefs.viewport_meta_zero_values_quirk);
   settings->setClobberUserAgentInitialScaleQuirk(
       prefs.clobber_user_agent_initial_scale_quirk);
   settings->setIgnoreMainFrameOverflowHiddenQuirk(
       prefs.ignore_main_frame_overflow_hidden_quirk);
   settings->setReportScreenSizeInPhysicalPixelsQuirk(
       prefs.report_screen_size_in_physical_pixels_quirk);
+  settings->setPreferHiddenVolumeControls(true);
 
   bool record_full_layer =
       RenderViewImpl::FromWebView(web_view)
           ? RenderViewImpl::FromWebView(web_view)->DoesRecordFullLayer()
           : false;
   settings->setMainFrameClipsContent(!record_full_layer);
 
   settings->setShrinksViewportContentToFit(true);
   settings->setUseMobileViewportStyle(true);
 #endif
@@ skipping 2651 matching lines @@
     std::vector<gfx::Size> sizes;
     ConvertToFaviconSizes(icon_urls[i].sizes(), &sizes);
     if (!url.isEmpty())
       urls.push_back(
           FaviconURL(url, ToFaviconType(icon_urls[i].iconType()), sizes));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content