Standardize Screen::GetCursorScreenPoint() on Env::last_mouse_location

ui/views/mus/mus_client.cc

 // Copyright 2016 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/views/mus/mus_client.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread.h"
 #include "components/discardable_memory/client/client_discardable_shared_memory_manager.h"
@@ skipping 244 matching lines @@
 }
 
 aura::client::CaptureClient* MusClient::GetCaptureClient() {
   return wm::CaptureController::Get();
 }
 
 aura::PropertyConverter* MusClient::GetPropertyConverter() {
   return property_converter_.get();
 }
 
-gfx::Point MusClient::GetCursorScreenPoint() {
-  return window_tree_client_->GetCursorScreenPoint();

[Elliot Glaysher, 2017/01/09 18:16:42]

Remove the window tree client code too?

(Or are you ignoring this since you plan on just deleting
services/ui/public/cpp/ soon?)

[sky, 2017/01/09 18:20:23]

We still need both. As clients don't see all events they need to use
WindowTreeClient::GetCursorScreenPoint() outside of event dispatching. In other
words Env::last_mouse_location() needs to call
WindowTreeClient::GetCursorScreenPoint() if called outside of event dispatching.
I filed 679402 for this.

-}
-
 aura::Window* MusClient::GetWindowAtScreenPoint(const gfx::Point& point) {
   for (aura::Window* root : window_tree_client_->GetRoots()) {
     aura::WindowTreeHost* window_tree_host = root->GetHost();
     if (!window_tree_host)
       continue;
     // TODO: this likely gets z-order wrong. http://crbug.com/663606.
     gfx::Point relative_point(point);
     window_tree_host->ConvertScreenInPixelsToDIP(&relative_point);
     if (gfx::Rect(root->bounds().size()).Contains(relative_point))
       return root->GetTopWindowContainingPoint(relative_point);
   }
   return nullptr;
 }
 
 std::unique_ptr<OSExchangeData::Provider> MusClient::BuildProvider() {
   return base::MakeUnique<aura::OSExchangeDataProviderMus>();
 }
 
 }  // namespace views