Plumb smooth scrolling in Chromium compositor

android_webview/browser/browser_view_renderer.h

Index: android_webview/browser/browser_view_renderer.h
diff --git a/android_webview/browser/browser_view_renderer.h b/android_webview/browser/browser_view_renderer.h
index 629bb41242321f90e534b900f0cfd5989d4ae254..d0fc03eb2ef241920848117079013a2658d5a260 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -79,6 +79,7 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
   // Sets the scale for logical<->physical pixel conversions.
   void SetDipScale(float dip_scale);
   float dip_scale() const { return dip_scale_; }
+  float page_scale_factor() const { return page_scale_factor_; }
 
   // Set the root layer scroll offset to |new_value|.
   void ScrollTo(gfx::Vector2d new_value);