Allow autoplay unmuted for WebAPK in the manifest scope

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 f3b38e87349573ba4ab264c280652036fdf0f701..d19296656b129838bf9a07b4efff0cfd8275684e 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -595,6 +595,12 @@ void RenderViewImpl::Initialize(
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
+#if defined(OS_ANDROID)
+  webview()->settings()->setMediaPlaybackGestureWhitelistScope(
+      blink::WebString::fromASCII(command_line.GetSwitchValueASCII(
+          switches::kMediaPlaybackGestureWhitelistScope)));
+#endif

[mlamouri (slow - plz ping), 2017/02/10 14:28:45]

Instead of having `#if defined`, could we do:
```
if (command_line.HasSwitch(switches::kMediaPlayerGestureWhitelistScope)) {
  webview()->settings()->setMediaPlaybackGestureWhitelistScope(
      blink::WebString::fromASCII(command_line.GetSwitchValueASCII(
          switches::kMediaPlaybackGestureWhitelistScope)));
}
```

It will keep the feature multi-platform for those that might be interested to
use it.

[Zhiqiang Zhang (Slow), 2017/02/10 14:47:10]

Done.

+
   if (command_line.HasSwitch(switches::kStatsCollectionController))
     stats_collection_observer_.reset(new StatsCollectionObserver(this));