Changes MouseEvent constructor to take changed_button_flags.

ui/aura/root_window.cc

Index: ui/aura/root_window.cc
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index 493f60ff5da5b665afc83ac1960f1bf181386d40..a819ef00a9f2fc14a1cd0062da192a55ef791988 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -380,7 +380,8 @@ void RootWindow::DispatchMouseExitToHidingWindow(Window* window) {
 }
 
 void RootWindow::DispatchMouseExitAtPoint(const gfx::Point& point) {
-  ui::MouseEvent event(ui::ET_MOUSE_EXITED, point, point, ui::EF_NONE);
+  ui::MouseEvent event(ui::ET_MOUSE_EXITED, point, point, ui::EF_NONE,
+                       ui::EF_NONE);
   DispatchDetails details =
       DispatchMouseEnterOrExit(event, ui::ET_MOUSE_EXITED);
   if (details.dispatcher_destroyed)
@@ -632,7 +633,7 @@ void RootWindow::UpdateCapture(Window* old_capture,
       old_capture->delegate()) {
     // Send a capture changed event with bogus location data.
     ui::MouseEvent event(ui::ET_MOUSE_CAPTURE_CHANGED, gfx::Point(),
-                         gfx::Point(), 0);
+                         gfx::Point(), 0, 0);
 
     DispatchDetails details = DispatchEvent(old_capture, &event);
     if (details.dispatcher_destroyed)
@@ -1136,7 +1137,8 @@ ui::EventDispatchDetails RootWindow::SynthesizeMouseMoveEvent() {
   ui::MouseEvent event(ui::ET_MOUSE_MOVED,
                        host_mouse_location,
                        host_mouse_location,
-                       ui::EF_IS_SYNTHESIZED);
+                       ui::EF_IS_SYNTHESIZED,
+                       0);
   return OnHostMouseEventImpl(&event);
 }