content: A couple of device-scale-factor fixes:

 * Implement WebWidgetClient::deviceScaleFactor
 * Set the device-scale-factor on WebView.

BUG=127795
TEST=manually

Review URL: https://chromiumcodereview.appspot.com/10481005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@140801 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index cb434d1..bc319e5 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1678,6 +1678,10 @@
   return screen_info_;
 }
 
+float RenderWidget::deviceScaleFactor() {
+  return device_scale_factor_;
+}
+
 void RenderWidget::resetInputMethod() {
   if (!input_method_is_active_)
     return;