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 fa417ad6707e2a82a77b79ac1a7fdfc926c2fda0..4736b6f40f03d686d1f7509a07dd3201de6c3eb0 100644
--- a/third_party/WebKit/Source/core/input/EventHandler.cpp
+++ b/third_party/WebKit/Source/core/input/EventHandler.cpp
@@ -678,9 +678,11 @@ WebInputEventResult EventHandler::handleMousePressEvent(
   HitTestResult hitTestResult = EventHandlingUtil::hitTestResultInFrame(
       m_frame, documentPoint, HitTestRequest::ReadOnly);
   InputDeviceCapabilities* sourceCapabilities =
-      mouseEvent.fromTouch()
-          ? InputDeviceCapabilities::firesTouchEventsSourceCapabilities()
-          : InputDeviceCapabilities::doesntFireTouchEventsSourceCapabilities();
+      m_frame->document()
+          ->domWindow()
+          ->getInputDeviceCapabilities()
+          ->firesTouchEvents(mouseEvent.fromTouch());
+
   if (eventResult == WebInputEventResult::NotHandled) {
     eventResult = m_mouseEventManager->handleMouseFocus(hitTestResult,
                                                         sourceCapabilities);