Add WebUI::GetDeviceScale

content/public/browser/web_ui.h

Index: content/public/browser/web_ui.h
diff --git a/content/public/browser/web_ui.h b/content/public/browser/web_ui.h
index 8bb0734d86dc5d917d8a3badd11ad36c0015c475..cdf23389250c75517ffa88c2dc45e736c37d5cae 100644
--- a/content/public/browser/web_ui.h
+++ b/content/public/browser/web_ui.h
@@ -52,6 +52,11 @@ class CONTENT_EXPORT WebUI {
   virtual WebUIController* GetController() const = 0;
   virtual void SetController(WebUIController* controller) = 0;
 
+  // Returns the renderer's scale.
+  // Whenever possible, WebUI should push resources with this scale to
+  // Javascript.

[Evan Stade, 2012/06/14 22:03:23]

reading this comment, I'd assume it returns the zoom factor of the contents, but
I don't think that's what it actually does. Hence it needs a better name and
comment.

+  virtual float GetRendererScale() const = 0;
+
   // Returns true if the favicon should be hidden for the current tab.
   virtual bool ShouldHideFavicon() const = 0;
   virtual void HideFavicon() = 0;