Visual viewport API initial implementation.

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 c4f0328e477ab6b19cec453e51cf1f1d77a4c69f..8b1d098649745b2669de61f8e50d3063c94506e2 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -36,6 +36,7 @@
 #include "core/dom/Document.h"
 #include "core/dom/ElementData.h"
 #include "core/dom/SpaceSplitString.h"
+#include "core/frame/VisualViewport.h"
 #include "core/html/CollectionType.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebFocusType.h"
@@ -208,6 +209,7 @@ public:
     void setScrollTop(double);
     int scrollWidth();
     int scrollHeight();
+    VisualViewport* viewport();
 
     void scrollBy(double x, double y);
     virtual void scrollBy(const ScrollToOptions&);
@@ -425,6 +427,7 @@ public:
     virtual void dispatchBlurEvent(Element* newFocusedElement, WebFocusType, InputDeviceCapabilities* sourceCapabilities = nullptr);
     virtual void dispatchFocusInEvent(const AtomicString& eventType, Element* oldFocusedElement, WebFocusType, InputDeviceCapabilities* sourceCapabilities = nullptr);
     void dispatchFocusOutEvent(const AtomicString& eventType, Element* newFocusedElement, InputDeviceCapabilities* sourceCapabilities = nullptr);
+    void dispatchViewportChangedEvent();
 
     String innerText();
     String outerText();