[Layout API] Add viewRect() to LayoutViewItem and use it in FrameView

third_party/WebKit/Source/core/layout/api/LayoutViewItem.h

Index: third_party/WebKit/Source/core/layout/api/LayoutViewItem.h
diff --git a/third_party/WebKit/Source/core/layout/api/LayoutViewItem.h b/third_party/WebKit/Source/core/layout/api/LayoutViewItem.h
index 0e5b84b0859072b96638f29ae4645ac09a38eef3..439fa6d7d4d24d0f95c6b290f94ceb70f15dab6a 100644
--- a/third_party/WebKit/Source/core/layout/api/LayoutViewItem.h
+++ b/third_party/WebKit/Source/core/layout/api/LayoutViewItem.h
@@ -50,6 +50,11 @@ public:
         return toView()->documentRect();
     }
 
+    LayoutRect viewRect() const
+    {
+        return toView()->viewRect();
+    }
+
     IntSize layoutSize(IncludeScrollbarsInRect scrollbars = ExcludeScrollbars) const
     {
         return toView()->layoutSize(scrollbars);