Visual viewport API initial implementation.

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

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index 7003675a5570233f05ad4e4d54e441ca8274acd1..ebe8c73b4e6c985e549c7a20e6bfc197839f1f62 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -721,6 +721,22 @@ int Element::clientHeight()
     return 0;
 }
 
+VisualViewport* Element::viewport()
+{
+    if (this != document().documentElement())
+        return nullptr;
+
+    document().updateLayoutIgnorePendingStylesheets();

[bokan, 2016/03/18 16:05:07]

You don't need this here. Having a VisualViewport element doesn't depend on
layout.

[ymalik, 2016/03/22 16:35:06]

Done.

+
+    LocalFrame* frame = document().frame();
+    if (!frame)
+        return nullptr;
+    FrameHost* host = frame->host();
+    if (!host)
+        return nullptr;
+    return &host->visualViewport();
+}
+
 double Element::scrollLeft()
 {
     document().updateLayoutIgnorePendingStylesheets();
@@ -2509,6 +2525,11 @@ void Element::dispatchFocusOutEvent(const AtomicString& eventType, Element* newF
     dispatchScopedEvent(FocusEvent::create(eventType, true, false, document().domWindow(), 0, newFocusedElement, sourceCapabilities));
 }
 
+void Element::dispatchViewportChangedEvent()
+{
+    dispatchEvent(Event::create(EventTypeNames::viewportchanged));
+}
+
 String Element::innerHTML() const
 {
     return createMarkup(this, ChildrenOnly);