Visual viewport API initial implementation.

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 3ae652d4a77fd109b1f91e9e93388b5ee049fd44..fd18957add20e3d040ac93821ed18a90500061c9 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -1228,6 +1228,13 @@ Element* Document::scrollingElement()
     return body();
 }
 
+VisualViewport* Document::visualViewport()
+{
+    if (FrameHost* host = frameHost())
+        return &host->visualViewport();

[esprehn, 2016/03/31 05:15:37]

does your spec say that a document without a view has a null viewport?

Your code here means:

document.implementation.createHTMLDocument().viewport is null.

[bokan, 2016/03/31 15:23:54]

That seems correct to me. I've added the wording in the spec.

+    return nullptr;
+}
+
 /*
  * Performs three operations:
  *  1. Convert control characters to spaces
@@ -4006,6 +4013,13 @@ void Document::enqueueMediaQueryChangeListeners(WillBeHeapVector<RefPtrWillBeMem
     ensureScriptedAnimationController().enqueueMediaQueryChangeListeners(listeners);
 }
 
+void Document::enqueueVisualViewportChangedEvent()
+{
+    RefPtrWillBeRawPtr<Event> event = Event::create(EventTypeNames::visualviewportchanged);
+    event->setTarget(this);
+    ensureScriptedAnimationController().enqueuePerFrameEvent(event.release());
+}
+
 void Document::dispatchEventsForPrinting()
 {
     if (!m_scriptedAnimationController)