Normalize top controls offset to (0, 1), Blink-side.

public/web/WebWidget.h

Index: public/web/WebWidget.h
diff --git a/public/web/WebWidget.h b/public/web/WebWidget.h
index bc9d4467b2fe0607fb7b6a428ffadd00e6bd4cf0..554df39f6a12de1a18d322664b485aec389f9dfe 100644
--- a/public/web/WebWidget.h
+++ b/public/web/WebWidget.h
@@ -271,9 +271,13 @@ public:
     // but not the select popup.
     virtual WebPagePopup* pagePopup() const { return 0; }
 
-    // Sets the height subtracted from the Widget to accomodate the top controls.
+    // TODO(aelias): Delete this after Blink roll.
     virtual void setTopControlsLayoutHeight(float) { }
 
+    // Notification about the top controls height.  If the boolean is true, then

[Rick Byers, 2015/02/07 03:13:52]

nit: it's not clear that height here is a normalized value.  Perhaps change the
param to 'heightFraction' and clarify in the comment.

[aelias_OOO_until_Jul13, 2015/02/07 03:32:08]

Height is still an absolute value here.  The one that's normalized is in
applyViewportDeltas.  I just renamed that one to topControlsShownRatioDelta to
clarify it.

(I needed to change this height method to add a boolean so that Blink is capable
of denormalizing the value without the layout size being changed.)

+    // the embedder shrunk the WebView size by the top controls height.
+    virtual void setTopControlsHeight(float height, bool topControlsShrinkLayoutSize) { }
+
 protected:
     ~WebWidget() { }
 };