Moved viewport layer registration into WebViewImpl.

third_party/WebKit/Source/core/frame/VisualViewport.h

Index: third_party/WebKit/Source/core/frame/VisualViewport.h
diff --git a/third_party/WebKit/Source/core/frame/VisualViewport.h b/third_party/WebKit/Source/core/frame/VisualViewport.h
index 295c52a5ef9f2c88d69bd495aa220c02a8b0a980..a35e30242aad672a0cb7c778bd916b0999116fbb 100644
--- a/third_party/WebKit/Source/core/frame/VisualViewport.h
+++ b/third_party/WebKit/Source/core/frame/VisualViewport.h
@@ -43,8 +43,8 @@
 #include <memory>
 
 namespace blink {
-class WebLayerTreeView;
 class WebScrollbarLayer;
+class WebLayer;
 }
 
 namespace blink {
@@ -89,6 +89,14 @@ public:
     {
         return m_innerViewportScrollLayer.get();
     }
+    GraphicsLayer* pageScaleLayer()
+    {
+        return m_pageScaleLayer.get();
+    }
+    GraphicsLayer* overscrollElasticityLayer()
+    {
+        return m_overscrollElasticityLayer.get();
+    }
 
     void initializeScrollbars();
 
@@ -124,8 +132,7 @@ public:
     // scale factor is left unchanged.
     bool magnifyScaleAroundAnchor(float magnifyDelta, const FloatPoint& anchor);
 
-    void registerLayersWithTreeView(WebLayerTreeView*) const;
-    void clearLayersForTreeView(WebLayerTreeView*) const;
+    void setScrollLayerOnScrollbars(WebLayer*) const;
 
     // The portion of the unzoomed frame visible in the visual viewport,
     // in partial CSS pixels. Relative to the main frame.