Move document.visualViewport to window.visualViewport

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

Index: third_party/WebKit/Source/core/frame/DOMWindow.h
diff --git a/third_party/WebKit/Source/core/frame/DOMWindow.h b/third_party/WebKit/Source/core/frame/DOMWindow.h
index 251fe2fac8169a5b7fa79d59b187a28cc8003756..73e89efe27f5df72160a2af3d4409ab02cbdd881 100644
--- a/third_party/WebKit/Source/core/frame/DOMWindow.h
+++ b/third_party/WebKit/Source/core/frame/DOMWindow.h
@@ -41,6 +41,7 @@ class ScrollToOptions;
 class SerializedScriptValue;
 class Storage;
 class StyleMedia;
+class VisualViewport;
 
 class CORE_EXPORT DOMWindow : public EventTargetWithInlineData, public DOMWindowBase64 {
     DEFINE_WRAPPERTYPEINFO();
@@ -91,6 +92,8 @@ public:
     double pageXOffset() const { return scrollX(); }
     double pageYOffset() const { return scrollY(); }
 
+    virtual VisualViewport* visualViewport() { return nullptr; }
+
     bool closed() const;
 
     // FIXME: This is not listed as a cross-origin accessible attribute, but in