Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

ui/aura/remote_window_tree_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/remote_window_tree_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
@@ skipping 131 matching lines @@
                                                                    ash_exit);
 }
 
 void HandleMetroExit() {
   DCHECK(aura::RemoteWindowTreeHostWin::Instance());
   aura::RemoteWindowTreeHostWin::Instance()->HandleMetroExit();
 }
 
 RemoteWindowTreeHostWin* g_instance = NULL;
 
+// static
 RemoteWindowTreeHostWin* RemoteWindowTreeHostWin::Instance() {
-  if (g_instance)
-    return g_instance;
-  return Create(gfx::Rect());
-}
-
-RemoteWindowTreeHostWin* RemoteWindowTreeHostWin::Create(
-    const gfx::Rect& bounds) {
-  g_instance = g_instance ? g_instance : new RemoteWindowTreeHostWin(bounds);
+  if (!g_instance)
+    g_instance = new RemoteWindowTreeHostWin(gfx::Rect());
   return g_instance;
 }
 
+// static
+void RemoteWindowTreeHostWin::SetInstance(RemoteWindowTreeHostWin* instance) {
+  CHECK(!g_instance);
+  g_instance = instance;
+}
+
 RemoteWindowTreeHostWin::RemoteWindowTreeHostWin(const gfx::Rect& bounds)
     : remote_window_(NULL),
       host_(NULL),
       ignore_mouse_moves_until_set_cursor_ack_(false),
       event_flags_(0),
       window_size_(aura::WindowTreeHost::GetNativeScreenSize()) {
   prop_.reset(new ui::ViewProp(NULL, kWindowTreeHostWinKey, this));
   CreateCompositor(GetAcceleratedWidget());
 }
 
@@ skipping 209 matching lines @@
   ui::RemoteInputMethodPrivateWin* remote_input_method_private =
       GetRemoteInputMethodPrivate();
   if (remote_input_method_private)
     remote_input_method_private->SetRemoteDelegate(this);
 }
 
 void RemoteWindowTreeHostWin::Hide() {
   NOTIMPLEMENTED();
 }
 
-void RemoteWindowTreeHostWin::ToggleFullScreen() {
-}
-
 gfx::Rect RemoteWindowTreeHostWin::GetBounds() const {
   return gfx::Rect(window_size_);
 }
 
 void RemoteWindowTreeHostWin::SetBounds(const gfx::Rect& bounds) {
   window_size_ = bounds.size();
   OnHostResized(bounds.size());
 }
 
-gfx::Insets RemoteWindowTreeHostWin::GetInsets() const {
-  return gfx::Insets();
-}
-
-void RemoteWindowTreeHostWin::SetInsets(const gfx::Insets& insets) {
-}
-
 gfx::Point RemoteWindowTreeHostWin::GetLocationOnNativeScreen() const {
   return gfx::Point(0, 0);
 }
 
 void RemoteWindowTreeHostWin::SetCapture() {
 }
 
 void RemoteWindowTreeHostWin::ReleaseCapture() {
 }
 
 bool RemoteWindowTreeHostWin::QueryMouseLocation(gfx::Point* location_return) {
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(window());
   if (cursor_client && !cursor_client->IsMouseEventsEnabled()) {
     *location_return = gfx::Point(0, 0);
     return false;
   }
   POINT pt;
   GetCursorPos(&pt);
   *location_return =
       gfx::Point(static_cast<int>(pt.x), static_cast<int>(pt.y));
   return true;
 }
 
-bool RemoteWindowTreeHostWin::ConfineCursorToRootWindow() {
-  return true;
-}
-
-void RemoteWindowTreeHostWin::UnConfineCursor() {
-}
-
 void RemoteWindowTreeHostWin::SetCursorNative(gfx::NativeCursor native_cursor) {
   if (!host_)
     return;
   host_->Send(
     new MetroViewerHostMsg_SetCursor(uint64(native_cursor.platform())));
 }
 
 void RemoteWindowTreeHostWin::MoveCursorToNative(const gfx::Point& location) {
   VLOG(1) << "In MoveCursorTo: " << location.x() << ", " << location.y();
   if (!host_)
@@ skipping 312 matching lines @@
 }
 
 void RemoteWindowTreeHostWin::SetEventFlags(uint32 flags) {
   if (flags == event_flags_)
     return;
   event_flags_ = flags;
   SetVirtualKeyStates(event_flags_);
 }
 
 }  // namespace aura