Desktop Aura: Allow tab drags out of window.

ui/base/win/events_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <windowsx.h>
 
 #include "ui/base/events.h"
 
 #include "base/logging.h"
 #include "base/time.h"
@@ skipping 197 matching lines @@
   DCHECK(IsNonClientMouseEvent(native_event) ||
          IsMouseWheelEvent(native_event));
   // Non-client message. The position is contained in a POINTS structure in
   // LPARAM, and is in screen coordinates so we have to convert to client.
   POINT native_point = { GET_X_LPARAM(native_event.lParam),
                          GET_Y_LPARAM(native_event.lParam) };
   ScreenToClient(native_event.hwnd, &native_point);
   return gfx::Point(native_point);
 }
 
+gfx::Point EventSystemLocationFromNative(
+    const base::NativeEvent& native_event) {
+  // TODO(ben): Needs to always return screen position here. Returning normal
+  // origin for now since that's obviously wrong.
+  return gfx::Point(0, 0);
+}
+
 KeyboardCode KeyboardCodeFromNative(const base::NativeEvent& native_event) {
   return KeyboardCodeForWindowsKeyCode(native_event.wParam);
 }
 
 bool IsMouseEvent(const base::NativeEvent& native_event) {
   return IsClientMouseEvent(native_event) ||
          IsNonClientMouseEvent(native_event);
 }
 
 int GetChangedMouseButtonFlagsFromNative(
@@ skipping 107 matching lines @@
 // Windows emulates mouse messages for touch events.
 bool IsMouseEventFromTouch(UINT message) {
   return (message == WM_MOUSEMOVE ||
       message == WM_LBUTTONDOWN || message == WM_LBUTTONUP ||
       message == WM_RBUTTONDOWN || message == WM_RBUTTONUP) &&
       (GetMessageExtraInfo() & MOUSEEVENTF_FROMTOUCH) ==
       MOUSEEVENTF_FROMTOUCH;
 }
 
 }  // namespace ui