Added experimental tilt and tiltDirection to the Touch interface

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 922487e26cebd25b1626c6c36508d8b54749d645..b9139e4f2e7445a2b2989b4ffe23c481d9f0f67b 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5127,7 +5127,7 @@ void Document::serviceScriptedAnimations(double monotonicAnimationStartTime)
     m_scriptedAnimationController->serviceScriptedAnimations(monotonicAnimationStartTime);
 }
 
-PassRefPtrWillBeRawPtr<Touch> Document::createTouch(DOMWindow* window, EventTarget* target, int identifier, double pageX, double pageY, double screenX, double screenY, double radiusX, double radiusY, float rotationAngle, float force) const
+PassRefPtrWillBeRawPtr<Touch> Document::createTouch(DOMWindow* window, EventTarget* target, int identifier, double pageX, double pageY, double screenX, double screenY, double radiusX, double radiusY, float rotationAngle, float tilt, float force) const
 {
     // Match behavior from when these types were integers, and avoid surprises from someone explicitly
     // passing Infinity/NaN.
@@ -5145,6 +5145,8 @@ PassRefPtrWillBeRawPtr<Touch> Document::createTouch(DOMWindow* window, EventTarg
         radiusY = 0;
     if (!std::isfinite(rotationAngle))
         rotationAngle = 0;
+    if (!std::isfinite(tilt))
+        tilt = 0;
     if (!std::isfinite(force))
         force = 0;
 
@@ -5153,7 +5155,7 @@ PassRefPtrWillBeRawPtr<Touch> Document::createTouch(DOMWindow* window, EventTarg
     // when this method should throw and nor is it by inspection of iOS behavior. It would be nice to verify any cases where it throws under iOS
     // and implement them here. See https://bugs.webkit.org/show_bug.cgi?id=47819
     LocalFrame* frame = window && window->isLocalDOMWindow() ? toLocalDOMWindow(window)->frame() : this->frame();
-    return Touch::create(frame, target, identifier, FloatPoint(screenX, screenY), FloatPoint(pageX, pageY), FloatSize(radiusX, radiusY), rotationAngle, force);
+    return Touch::create(frame, target, identifier, FloatPoint(screenX, screenY), FloatPoint(pageX, pageY), FloatSize(radiusX, radiusY), rotationAngle, tilt, force);
 }
 
 PassRefPtrWillBeRawPtr<TouchList> Document::createTouchList(WillBeHeapVector<RefPtrWillBeMember<Touch>>& touches) const