Visual viewport API initial implementation.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 703 matching lines @@
                 return adjustLayoutUnitForAbsoluteZoom(layoutView->overflowClipRect(LayoutPoint()).height(), layoutView->styleRef()).round();
             return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutView->layoutSize().height()), layoutView->styleRef()).round();
         }
     }
 
     if (LayoutBox* layoutObject = layoutBox())
         return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedClientHeight()), layoutObject->styleRef()).round();
     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();
 
     if (document().scrollingElement() == this) {
         if (document().domWindow())
             return document().domWindow()->scrollX();
         return 0;
     }
 
@@ skipping 1768 matching lines @@
     dispatchScopedEvent(FocusEvent::create(eventType, true, false, document().domWindow(), 0, oldFocusedElement, sourceCapabilities));
 }
 
 void Element::dispatchFocusOutEvent(const AtomicString& eventType, Element* newFocusedElement, InputDeviceCapabilities* sourceCapabilities)
 {
     ASSERT(!EventDispatchForbiddenScope::isEventDispatchForbidden());
     ASSERT(eventType == EventTypeNames::focusout || eventType == EventTypeNames::DOMFocusOut);
     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);
 }
 
 String Element::outerHTML() const
 {
     return createMarkup(this);
 }
 
@@ skipping 1148 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink