Blink: Pass 'unobscured' rect to WebPlugins.

Source/core/frame/FrameView.h

Index: Source/core/frame/FrameView.h
diff --git a/Source/core/frame/FrameView.h b/Source/core/frame/FrameView.h
index 4056cc832a1a45f5b92b6810bf40a0e9dc0645a1..1e022271b3fce2ad91c6b97f5affd432f1a6ef74 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -156,6 +156,10 @@ public:
 
     IntRect windowClipRectForFrameOwner(const HTMLFrameOwnerElement*) const;
 
+    // Returns the clip rect for the element without clipping to the root view.
+    // Used to determine the visible portion of elements below the fold.
+    IntRect unobscuredRectForFrameOwner(const HTMLFrameOwnerElement*) const;
+
     float visibleContentScaleFactor() const { return m_visibleContentScaleFactor; }
     void setVisibleContentScaleFactor(float);