Fix main thread top controls scrolling to mirror CC.

third_party/WebKit/public/web/WebWidget.h

Index: third_party/WebKit/public/web/WebWidget.h
diff --git a/third_party/WebKit/public/web/WebWidget.h b/third_party/WebKit/public/web/WebWidget.h
index 04ba9c0d6474e112e6d6f5a684e5750c3a291575..c58b7f7731d999332a57887eb1fe93a6a213388a 100644
--- a/third_party/WebKit/public/web/WebWidget.h
+++ b/third_party/WebKit/public/web/WebWidget.h
@@ -66,6 +66,14 @@ public:
     // Called to resize the WebWidget.
     virtual void resize(const WebSize&) { }
 
+    // Called to resize the WebWidget and top controls at the same time. Change
+    // both the widget size and top controls layout affecting height at the same
+    // time to prevent changing the viewport scroll offset due to clamping.
+    virtual void resize(
+        const WebSize&,
+        float topControlsHeight,
+        bool topControlsShrinkLayoutSize) { }
+
     // Resizes the unscaled visual viewport. Normally the unscaled visual
     // viewport is the same size as the main frame. The passed size becomes the
     // size of the viewport when unscaled (i.e. scale = 1). This is used to
@@ -246,10 +254,6 @@ public:
     // but not the select popup.
     virtual WebPagePopup* pagePopup() const { return 0; }
 
-    // Notification about the top controls height.  If the boolean is true, then
-    // the embedder shrunk the WebView size by the top controls height.
-    virtual void setTopControlsHeight(float height, bool topControlsShrinkLayoutSize) { }
-
     // Updates top controls constraints and current state. Allows embedder to
     // control what are valid states for top controls and if it should animate.
     virtual void updateTopControlsState(WebTopControlsState constraints, WebTopControlsState current, bool animate) { }