Expose fractional TouchEvent coordinates

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 88434192920c790fc09c45864ec8c670fcc7c8e6..112120d829f68ed6986e248ccbe49beea5b7e8b7 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5222,14 +5222,33 @@ void Document::serviceScriptedAnimations(double monotonicAnimationStartTime)
     m_scriptedAnimationController->serviceScriptedAnimations(monotonicAnimationStartTime);
 }
 
-PassRefPtrWillBeRawPtr<Touch> Document::createTouch(DOMWindow* window, EventTarget* target, int identifier, int pageX, int pageY, int screenX, int screenY, int radiusX, int 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 force) const
+{
+    // Match behavior from when these types were integers, and avoid surprises from someone explicitly
+    // passing Infinity/NaN.
+    if (!std::isfinite(pageX))
+        pageX = 0;
+    if (!std::isfinite(pageY))
+        pageY = 0;
+    if (!std::isfinite(screenX))
+        screenX = 0;
+    if (!std::isfinite(screenY))
+        screenY = 0;
+    if (!std::isfinite(radiusX))
+        radiusX = 0;
+    if (!std::isfinite(radiusY))
+        radiusY = 0;
+    if (!std::isfinite(rotationAngle))
+        rotationAngle = 0;
+    if (!std::isfinite(force))
+        force = 0;
+
     // FIXME: It's not clear from the documentation at
     // http://developer.apple.com/library/safari/#documentation/UserExperience/Reference/DocumentAdditionsReference/DocumentAdditions/DocumentAdditions.html
     // 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->frame() : this->frame();
-    return Touch::create(frame, target, identifier, screenX, screenY, pageX, pageY, radiusX, radiusY, rotationAngle, force);
+    return Touch::create(frame, target, identifier, FloatPoint(screenX, screenY), FloatPoint(pageX, pageY), FloatSize(radiusX, radiusY), rotationAngle, force);
 }
 
 PassRefPtrWillBeRawPtr<TouchList> Document::createTouchList(WillBeHeapVector<RefPtrWillBeMember<Touch> >& touches) const