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

content/browser/renderer_host/render_widget_host_view_aura.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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 2252 matching lines @@
   aura::Window* root_window = window_->GetRootWindow();
   if (!root_window)
     return false;
 
   if (mouse_locked_)
     return true;
 
   mouse_locked_ = true;
 #if !defined(OS_WIN)
   window_->SetCapture();
+#else
+  if (gfx::Screen::GetScreenFor(window_) ==
+      gfx::Screen::GetNativeScreen()) {
+    RECT window_rect = window_->GetBoundsInScreen().ToRECT();
+    ::ClipCursor(&window_rect);
+  }
 #endif
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(root_window);
   if (cursor_client) {
     cursor_client->HideCursor();
     cursor_client->LockCursor();
   }
 
   if (ShouldMoveToCenter()) {
     synthetic_move_sent_ = true;
     window_->MoveCursorTo(gfx::Rect(window_->bounds().size()).CenterPoint());
   }
   tooltip_disabler_.reset(new aura::client::ScopedTooltipDisabler(root_window));
-
-  root_window->GetHost()->ConfineCursorToRootWindow();

[oshima, 2014/03/26 00:56:03]

This was added in https://codereview.chromium.org/49383004
but this makes sense only on Windows. This is no-op and not necessary on
linux_aura and is actually wrong on cros.

[Ben Goodger (Google), 2014/03/26 05:11:08]

Maybe peel this out as a separate CL?

   return true;
 }
 
 void RenderWidgetHostViewAura::UnlockMouse() {
   tooltip_disabler_.reset();
 
   aura::Window* root_window = window_->GetRootWindow();
   if (!mouse_locked_ || !root_window)
     return;
 
   mouse_locked_ = false;
 
 #if !defined(OS_WIN)
   window_->ReleaseCapture();
+#else
+  ::ClipCursor(NULL);
 #endif
   window_->MoveCursorTo(unlocked_mouse_position_);
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(root_window);
   if (cursor_client) {
     cursor_client->UnlockCursor();
     cursor_client->ShowCursor();
   }
 
   host_->LostMouseLock();
-  root_window->GetHost()->UnConfineCursor();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewAura, ui::TextInputClient implementation:
 void RenderWidgetHostViewAura::SetCompositionText(
     const ui::CompositionText& composition) {
   if (!host_)
     return;
 
   // ui::CompositionUnderline should be identical to
@@ skipping 1292 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content