[Master/Overview CL] Make PageScaleFactor work for oopif subframe.

third_party/WebKit/public/web/WebView.h

Index: third_party/WebKit/public/web/WebView.h
diff --git a/third_party/WebKit/public/web/WebView.h b/third_party/WebKit/public/web/WebView.h
index 4c1b225a102bff17c9b739da9e81039e15d85b93..781256b5b7c0b7d9d6f886f8d356ce33030cd6a1 100644
--- a/third_party/WebKit/public/web/WebView.h
+++ b/third_party/WebKit/public/web/WebView.h
@@ -273,6 +273,9 @@ class WebView : protected WebWidget {
   // Scales the page without affecting layout by using the visual viewport.
   virtual void setPageScaleFactor(float) = 0;
 
+  // Returns the scale factor clamped within the current limits.
+  virtual float clampPageScaleFactorToLimits(float) const = 0;
+
   // Sets the offset of the visual viewport within the main frame, in
   // partial CSS pixels. The offset will be clamped so the visual viewport
   // stays within the frame's bounds.