Implement the document.createTouch and document.createTouchList APIs

These are Apple extensions to the document object present on iOS
and are used by several sites to detect touch event support.

See
http://developer.apple.com/library/safari/#documentation/UserExperience/Reference/DocumentAdditionsReference/DocumentAdditions/DocumentAdditions.html
for Apple's documentation.

Upstreaming to webkit being tracked in
https://bugs.webkit.org/show_bug.cgi?id=47676

Bug: 2996106

Change-Id: I761b1494af60b5095ad9c47d54eb7240d47ae985

3 files changed, 35 insertions, 0 deletions

diff --git a/WebCore/dom/Document.cpp b/WebCore/dom/Document.cpp
index 333b8db..bffc07c 100644
--- a/WebCore/dom/Document.cpp
+++ b/WebCore/dom/Document.cpp
@@ -4826,4 +4826,17 @@ void Document::decrementLoadEventDelayCount()
         frame()->loader()->checkCompleted();
 }
 
+#if ENABLE(TOUCH_EVENTS)
+PassRefPtr<Touch> Document::createTouch(DOMWindow* window, Node* target, int identifier, int pageX, int pageY, int screenX, int screenY, ExceptionCode&) const
+{
+    Frame* frame = window ? window->frame() : this->frame();
+    return Touch::create(frame, target, identifier, screenX, screenY, pageX, pageY);
+}
+
+PassRefPtr<TouchList> Document::createTouchList(ExceptionCode&) const
+{
+    return TouchList::create();
+}
+#endif
+
 } // namespace WebCore
diff --git a/WebCore/dom/Document.h b/WebCore/dom/Document.h
index fa3d9fb..41a486a 100644
--- a/WebCore/dom/Document.h
+++ b/WebCore/dom/Document.h
@@ -136,6 +136,11 @@ class XPathResult;
 struct DashboardRegionValue;
 #endif
 
+#if ENABLE(TOUCH_EVENTS)
+class Touch;
+class TouchList;
+#endif
+
 typedef int ExceptionCode;
 
 class FormElementKey {
@@ -1041,6 +1046,11 @@ public:
     void decrementLoadEventDelayCount();
     bool isDelayingLoadEvent() const { return m_loadEventDelayCount; }
 
+#if ENABLE(TOUCH_EVENTS)
+    PassRefPtr<Touch> createTouch(DOMWindow*, Node*, int identifier, int pageX, int pageY, int screenX, int screenY, ExceptionCode&) const;
+    PassRefPtr<TouchList> createTouchList(ExceptionCode&) const;
+#endif
+
 protected:
     Document(Frame*, const KURL& url, bool isXHTML, bool isHTML, const KURL& baseURL = KURL());
 
diff --git a/WebCore/dom/Document.idl b/WebCore/dom/Document.idl
index e551f88..02eb30d 100644
--- a/WebCore/dom/Document.idl
+++ b/WebCore/dom/Document.idl
@@ -321,6 +321,18 @@ module core {
         attribute [DontEnum,Conditional=TOUCH_EVENTS,EnabledAtRuntime] EventListener ontouchmove;
         attribute [DontEnum,Conditional=TOUCH_EVENTS,EnabledAtRuntime] EventListener ontouchend;
         attribute [DontEnum,Conditional=TOUCH_EVENTS,EnabledAtRuntime] EventListener ontouchcancel;
+#if defined(ENABLE_TOUCH_EVENTS) && ENABLE_TOUCH_EVENTS
+        [ReturnsNew] Touch createTouch(in DOMWindow window,
+                                       in Node target,
+                                       in long identifier,
+                                       in long pageX,
+                                       in long pageY,
+                                       in long ScreenX,
+                                       in long screenY)
+            raises (DOMException);
+        [ReturnsNew] TouchList createTouchList()
+            raises (DOMException);
+#endif
         attribute [DontEnum, Conditional=FULLSCREEN_API] EventListener onwebkitfullscreenchange;
 #endif