Compute pageScaleFactor on page so that fixed layout page fits width of window.

content/public/renderer/render_view.h

Index: content/public/renderer/render_view.h
diff --git a/content/public/renderer/render_view.h b/content/public/renderer/render_view.h
index 14020aebf208296b06c5435663bf5c1e19659d06..55b84364110923fa06cc8898bea1f090a5dcbe8c 100644
--- a/content/public/renderer/render_view.h
+++ b/content/public/renderer/render_view.h
@@ -68,6 +68,10 @@ class CONTENT_EXPORT RenderView : public IPC::Message::Sender {
   // Gets WebKit related preferences associated with this view.
   virtual WebPreferences& GetWebkitPreferences() = 0;
 
+  // Gets the default device scale factor of the render view. This is used to
+  // compute the default layout width in absence of a viewport meta tag.
+  virtual int GetDefaultDeviceScaleFactor() const = 0;
+
   // Returns the associated WebView. May return NULL when the view is closing.
   virtual WebKit::WebView* GetWebView() = 0;