Move touch CTM from X into Chrome

ui/aura/window_tree_host.h

 // 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.
 
 #ifndef UI_AURA_WINDOW_TREE_HOST_H_
 #define UI_AURA_WINDOW_TREE_HOST_H_
 
 #include <vector>
 
 #include "base/event_types.h"
@@ skipping 98 matching lines @@
   void OnCursorVisibilityChanged(bool visible);
 
   // Moves the cursor to the specified location relative to the root window.
   void MoveCursorTo(const gfx::Point& location);
 
   // Moves the cursor to the |host_location| given in host coordinates.
   void MoveCursorToHostLocation(const gfx::Point& host_location);
 
   gfx::NativeCursor last_cursor() const { return last_cursor_; }
 
+  void UpdateDisplayID(int64 id1, int64 id2) {
+    display_ids_.first = id1;
+    display_ids_.second = id2;
+  }
+
+  const std::pair<int64, int64>& display_ids() const {
+     return display_ids_;
+  }
+
   // Returns the EventSource responsible for dispatching events to the window
   // tree.
   virtual ui::EventSource* GetEventSource() = 0;
 
   // Returns the accelerated widget.
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() = 0;
 
   // Shows the WindowTreeHost.
   virtual void Show() = 0;
 
@@ skipping 62 matching lines @@
   scoped_ptr<WindowEventDispatcher> dispatcher_;
 
   scoped_ptr<ui::Compositor> compositor_;
 
   // Last cursor set.  Used for testing.
   gfx::NativeCursor last_cursor_;
   gfx::Point last_cursor_request_position_in_host_;
 
   scoped_ptr<ui::ViewProp> prop_;
 
+  // The display IDs associated with this root window.
+  // In single monitor or extended mode dual monitor case, the root window
+  // is associated with one display.
+  // In mirror mode dual monitors case, the root window is associated with
+  // both displays.
+  std::pair<int64, int64> display_ids_;

[oshima, 2014/05/01 09:35:42]

this can move to ash_window_tree_host_x11 now?

[Yufeng Shen (Slow to review), 2014/05/01 22:43:48]

In touch_transformer_controller.cc I need to get a hold
of WindowTreeHost* to call UpdateDisplayID().
The way I do is calling
display_controller->GetPrimaryRootWindow()/GetRootWindowForDisplayID(id)->GetHost()

How can I get a hold of AshWindowTreeHost* ? 
Do you think we should expose similar getter to query
DisplayController::window_tree_hosts_ to return AshWindowTreeHost* ?

[oshima, 2014/05/01 23:07:56]

You can use RootWindowController()->ash_host()

[Yufeng Shen (Slow to review), 2014/05/02 00:03:39]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHost);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_TREE_HOST_H_