Desktop Aura: Allow tab drags out of window.

ui/aura/root_window_host_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 "ui/aura/root_window_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
@@ skipping 135 matching lines @@
 }
 
 gfx::AcceleratedWidget RootWindowHostWin::GetAcceleratedWidget() {
   return hwnd();
 }
 
 void RootWindowHostWin::Show() {
   ShowWindow(hwnd(), SW_SHOWNORMAL);
 }
 
+void RootWindowHostWin::Hide() {
+  NOTIMPLEMENTED();
+}
+
 void RootWindowHostWin::ToggleFullScreen() {
   gfx::Rect target_rect;
   if (!fullscreen_) {
     fullscreen_ = true;
     saved_window_style_ = GetWindowLong(hwnd(), GWL_STYLE);
     saved_window_ex_style_ = GetWindowLong(hwnd(), GWL_EXSTYLE);
     GetWindowRect(hwnd(), &saved_window_rect_);
     SetWindowLong(hwnd(), GWL_STYLE,
                   saved_window_style_ & ~(WS_CAPTION | WS_THICKFRAME));
     SetWindowLong(hwnd(), GWL_EXSTYLE,
@@ skipping 177 matching lines @@
 }
 
 void RootWindowHostWin::OnSize(UINT param, const CSize& size) {
   // Minimizing resizes the window to 0x0 which causes our layout to go all
   // screwy, so we just ignore it.
   if (param != SIZE_MINIMIZED)
     delegate_->OnHostResized(gfx::Size(size.cx, size.cy));
 }
 
 }  // namespace aura