Fix element visibility check for validation bubbles and SELECT popups.

third_party/WebKit/Source/core/dom/Element.h

Index: third_party/WebKit/Source/core/dom/Element.h
diff --git a/third_party/WebKit/Source/core/dom/Element.h b/third_party/WebKit/Source/core/dom/Element.h
index 673c4e4454460268e5610f94ebcb4b854cf75f9e..b35cb508acf68d6d90a2b5f658e7b0e7d1248d74 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -220,6 +220,10 @@ public:
     virtual void scrollTo(const ScrollToOptions&);
 
     IntRect boundsInViewport() const;
+    // Returns an intersection rectangle of the bounds rectangle and the
+    // viewport rectangle, in the visual viewport coordinate. This function is
+    // used to show popups beside this element.
+    IntRect visibleBoundsInVisualViewport() const;
 
     ClientRectList* getClientRects();
     ClientRect* getBoundingClientRect();