Proper MouseEvent targeting. Adds a Window method that locates a Window for a given point.

aura/event.cc

Index: aura/event.cc
===================================================================
--- aura/event.cc	(revision 98852)
+++ aura/event.cc	(working copy)
@@ -4,6 +4,8 @@
 
 #include "aura/event.h"
 
+#include "aura/window.h"
+
 namespace aura {
 
 Event::Event(ui::EventType type, int flags)
@@ -27,5 +29,18 @@
       flags_(copy.flags_) {
 }
 
+LocatedEvent::LocatedEvent(const LocatedEvent& model,
+                           Window* source,
+                           Window* target)
+    : Event(model),
+      location_(model.location_) {
+  if (target && target != source)
+    Window::ConvertPointToWindow(source, target, &location_);
+}
+
+MouseEvent::MouseEvent(const MouseEvent& model, Window* source, Window* target)
+    : LocatedEvent(model, source, target) {
+}
+
 }  // namespace aura