Enable new media playback UI for clank.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index c9344b922c1376b410ba7072234acd59947c539d..30b67b8c1c9c94f375460268b0538e0590e8fb35 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1161,6 +1161,10 @@ void RenderView::ApplyWebPreferences(const WebPreferences& prefs,
   settings->setReportScreenSizeInPhysicalPixelsQuirk(
       prefs.report_screen_size_in_physical_pixels_quirk);
 
+  // The following two lines enable the M46 media playback UI.
+  WebRuntimeFeatures::enableNewMediaPlaybackUi(true);

[jochen (gone - plz use gerrit), 2015/08/06 07:44:25]

this should go into content/child/runtime_features.cc

[liberato (no reviews please), 2015/08/06 14:09:39]

Done.

+  settings->setPreferHiddenVolumeControls(true);
+
   bool record_full_layer =
       RenderViewImpl::FromWebView(web_view)
           ? RenderViewImpl::FromWebView(web_view)->DoesRecordFullLayer()