Delay instantiating InputDeviceCapabilities until accessed.

third_party/WebKit/Source/core/events/MouseEvent.cpp

Index: third_party/WebKit/Source/core/events/MouseEvent.cpp
diff --git a/third_party/WebKit/Source/core/events/MouseEvent.cpp b/third_party/WebKit/Source/core/events/MouseEvent.cpp
index 9da39b5fc792ed26f2d0de0c765b930c365d4d4d..4b30e80042ab8887e1e2d9fafd9a9f6df0236e5b 100644
--- a/third_party/WebKit/Source/core/events/MouseEvent.cpp
+++ b/third_party/WebKit/Source/core/events/MouseEvent.cpp
@@ -164,10 +164,7 @@ MouseEvent::MouseEvent(const AtomicString& eventType,
           detail,
           static_cast<PlatformEvent::Modifiers>(event.modifiers()),
           TimeTicks::FromSeconds(event.timeStampSeconds()),
-          abstractView
-              ? abstractView->getInputDeviceCapabilities()->firesTouchEvents(
-                    event.fromTouch())
-              : nullptr),
+          InputDeviceCapabilitiesValue(event.fromTouch())),
       m_screenLocation(event.globalX, event.globalY),
       m_movementDelta(flooredIntPoint(event.movementInRootFrame())),
       m_positionType(PositionType::Position),
@@ -208,10 +205,7 @@ MouseEvent::MouseEvent(const AtomicString& eventType,
           detail,
           modifiers,
           platformTimeStamp,
-          abstractView
-              ? abstractView->getInputDeviceCapabilities()->firesTouchEvents(
-                    syntheticEventType == FromTouch)
-              : nullptr),
+          InputDeviceCapabilitiesValue(syntheticEventType == FromTouch)),
       m_screenLocation(screenX, screenY),
       m_movementDelta(movementX, movementY),
       m_positionType(syntheticEventType == Positionless
@@ -330,7 +324,7 @@ void MouseEvent::initMouseEvent(ScriptState* scriptState,
   initModifiers(ctrlKey, altKey, shiftKey, metaKey);
   initMouseEventInternal(type, canBubble, cancelable, view, detail, screenX,
                          screenY, clientX, clientY, modifiers(), button,
-                         relatedTarget, nullptr, buttons);
+                         relatedTarget, InputDeviceCapabilities::Null, buttons);
 }
 
 void MouseEvent::initMouseEventInternal(
@@ -346,7 +340,7 @@ void MouseEvent::initMouseEventInternal(
     PlatformEvent::Modifiers modifiers,
     short button,
     EventTarget* relatedTarget,
-    InputDeviceCapabilities* sourceCapabilities,
+    const InputDeviceCapabilitiesValue& sourceCapabilities,
     unsigned short buttons) {
   initUIEventInternal(type, canBubble, cancelable, relatedTarget, view, detail,
                       sourceCapabilities);
@@ -455,7 +449,7 @@ DispatchEventResult MouseEventDispatchMediator::dispatchEvent(
       mouseEvent.view(), mouseEvent.detail(), mouseEvent.screenX(),
       mouseEvent.screenY(), mouseEvent.clientX(), mouseEvent.clientY(),
       mouseEvent.modifiers(), mouseEvent.button(), relatedTarget,
-      mouseEvent.sourceCapabilities(), mouseEvent.buttons());
+      mouseEvent.sourceCapabilitiesValue(), mouseEvent.buttons());
   doubleClickEvent->setComposed(mouseEvent.composed());
 
   // Inherit the trusted status from the original event.