Track constant InputDeviceCapabilities objects per-window.

third_party/WebKit/Source/core/input/EventHandler.cpp

Index: third_party/WebKit/Source/core/input/EventHandler.cpp
diff --git a/third_party/WebKit/Source/core/input/EventHandler.cpp b/third_party/WebKit/Source/core/input/EventHandler.cpp
index e7b31f24dd0fcd9b26c4c7e4aebadf2fd74af7c7..41cb83e76a3dba6bad0df20b3f499a874f7ed1d0 100644
--- a/third_party/WebKit/Source/core/input/EventHandler.cpp
+++ b/third_party/WebKit/Source/core/input/EventHandler.cpp
@@ -679,9 +679,13 @@ WebInputEventResult EventHandler::handleMousePressEvent(
   HitTestResult hitTestResult = EventHandlingUtil::hitTestResultInFrame(
       m_frame, documentPoint, HitTestRequest::ReadOnly);
   InputDeviceCapabilities* sourceCapabilities =
-      mouseEvent.getSyntheticEventType() == PlatformMouseEvent::FromTouch
-          ? InputDeviceCapabilities::firesTouchEventsSourceCapabilities()
-          : InputDeviceCapabilities::doesntFireTouchEventsSourceCapabilities();
+      m_frame->document()
+          ->domWindow()
+          ->getInputDeviceCapabilities()
+          ->firesTouchEvents(
+              mouseEvent.getSyntheticEventType() ==
+              PlatformMouseEvent::FromTouch);
+
   if (eventResult == WebInputEventResult::NotHandled) {
     eventResult = m_mouseEventManager->handleMouseFocus(hitTestResult,
                                                         sourceCapabilities);