Make input event forwarding work in --site-per-process.

Source/web/WebInputEventConversion.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 466 matching lines @@
 static FloatPoint convertAbsoluteLocationForRenderObjectFloat(const LayoutPoint& location, const RenderObject& renderObject)
 {
     return renderObject.absoluteToLocal(location, UseTransforms);
 }
 
 static IntPoint convertAbsoluteLocationForRenderObject(const LayoutPoint& location, const RenderObject& renderObject)
 {
     return roundedIntPoint(convertAbsoluteLocationForRenderObjectFloat(location, renderObject));
 }
 
-static void updateWebMouseEventFromCoreMouseEvent(const MouseRelatedEvent& event, const Widget& widget, const RenderObject& renderObject, WebMouseEvent& webEvent)
+static void updateWebMouseEventFromCoreMouseEvent(const MouseRelatedEvent& event, const Widget* widget, const RenderObject& renderObject, WebMouseEvent& webEvent)
 {
     webEvent.timeStampSeconds = event.timeStamp() / millisPerSecond;
     webEvent.modifiers = getWebInputModifiers(event);
 
-    ScrollView* view =  toScrollView(widget.parent());
+    ScrollView* view = widget ? toScrollView(widget->parent()) : 0;

[Charlie Reis, 2014/10/10 03:42:39]

This was a bit awkward, but we don't have a widget for the RemoteFrame.  Not
sure if we would have a ScrollView for it even if we did.

[kenrb, 2014/10/10 19:59:08]

I am guessing webFrame->frame()->view() is null in ChromeClientImpl? We might
want a comment about that, because it should be changed back to a reference
later, when RemoteFrame has a RemoteFrameView. After that, this will need to
check widget.isScrollView(), because RemoteFrameView is a Widget but not a
ScrollView. 

[Charlie Reis, 2014/10/10 20:25:24]

Yes, and done.

     IntPoint windowPoint = IntPoint(event.absoluteLocation().x(), event.absoluteLocation().y());
     if (view)
         windowPoint = view->contentsToWindow(windowPoint);
     webEvent.globalX = event.screenX();
     webEvent.globalY = event.screenY();
     webEvent.windowX = windowPoint.x();
     webEvent.windowY = windowPoint.y();
     IntPoint localPoint = convertAbsoluteLocationForRenderObject(event.absoluteLocation(), renderObject);
     webEvent.x = localPoint.x();
     webEvent.y = localPoint.y();
 }
 
 WebMouseEventBuilder::WebMouseEventBuilder(const Widget* widget, const RenderObject* renderObject, const MouseEvent& event)
 {
     if (event.type() == EventTypeNames::mousemove)
         type = WebInputEvent::MouseMove;
     else if (event.type() == EventTypeNames::mouseout)
         type = WebInputEvent::MouseLeave;
     else if (event.type() == EventTypeNames::mouseover)
         type = WebInputEvent::MouseEnter;
     else if (event.type() == EventTypeNames::mousedown)
         type = WebInputEvent::MouseDown;
     else if (event.type() == EventTypeNames::mouseup)
         type = WebInputEvent::MouseUp;
     else if (event.type() == EventTypeNames::contextmenu)
         type = WebInputEvent::ContextMenu;
     else
         return; // Skip all other mouse events.
 
-    updateWebMouseEventFromCoreMouseEvent(event, *widget, *renderObject, *this);
+    updateWebMouseEventFromCoreMouseEvent(event, widget, *renderObject, *this);
 
     switch (event.button()) {
     case LeftButton:
         button = WebMouseEvent::ButtonLeft;
         break;
     case MiddleButton:
         button = WebMouseEvent::ButtonMiddle;
         break;
     case RightButton:
         button = WebMouseEvent::ButtonRight;
@@ skipping 109 matching lines @@
 
     button = static_cast<Button>(event.button());
     clickCount = event.clickCount();
 }
 
 WebMouseWheelEventBuilder::WebMouseWheelEventBuilder(const Widget* widget, const RenderObject* renderObject, const WheelEvent& event)
 {
     if (event.type() != EventTypeNames::wheel && event.type() != EventTypeNames::mousewheel)
         return;
     type = WebInputEvent::MouseWheel;
-    updateWebMouseEventFromCoreMouseEvent(event, *widget, *renderObject, *this);
+    updateWebMouseEventFromCoreMouseEvent(event, widget, *renderObject, *this);
     deltaX = -event.deltaX();
     deltaY = -event.deltaY();
     wheelTicksX = event.ticksX();
     wheelTicksY = event.ticksY();
     scrollByPage = event.deltaMode() == WheelEvent::DOM_DELTA_PAGE;
 }
 
 WebKeyboardEventBuilder::WebKeyboardEventBuilder(const KeyboardEvent& event)
 {
     if (event.type() == EventTypeNames::keydown)
@@ skipping 165 matching lines @@
     modifiers = getWebInputModifiers(event);
 
     globalX = event.screenX();
     globalY = event.screenY();
     IntPoint localPoint = convertAbsoluteLocationForRenderObject(event.absoluteLocation(), *renderObject);
     x = localPoint.x();
     y = localPoint.y();
 }
 
 } // namespace blink