Handle floating point coordinates from ozone to exosphere

ui/aura/client/screen_position_client.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_SCREEN_POSITION_CLIENT_H_
 #define UI_AURA_SCREEN_POSITION_CLIENT_H_
 
 #include "ui/aura/aura_export.h"
 #include "ui/aura/window.h"
 
@@ skipping 11 matching lines @@
 class AURA_EXPORT ScreenPositionClient {
  public:
   virtual ~ScreenPositionClient() {}
 
   // Converts the |screen_point| from a given |window|'s coordinate space
   // into screen coordinate space.
   virtual void ConvertPointToScreen(const Window* window,
                                     gfx::Point* point) = 0;
   virtual void ConvertPointFromScreen(const Window* window,
                                       gfx::Point* point) = 0;
+  virtual void ConvertPointToScreenF(const Window* window,

[oshima, 2017/01/20 22:11:54]

I have a slight preference for ConvertPointFToScreen. I'll leave it to the owner
though.

+                                     gfx::PointF* point) = 0;
+  virtual void ConvertPointFromScreenF(const Window* window,
+                                       gfx::PointF* point) = 0;
   // Converts the |screen_point| from root window host's coordinate of
   // into screen coordinate space.
   // A typical example of using this function instead of ConvertPointToScreen is
   // when X's native input is captured by a drag operation.
   // See the comments for ash::GetRootWindowRelativeToWindow for details.
   virtual void ConvertHostPointToScreen(Window* root_window,
                                         gfx::Point* point) = 0;
   // Sets the bounds of the window. The implementation is responsible
   // for finding out and translating the right coordinates for the |window|.
   virtual void SetBounds(Window* window,
                          const gfx::Rect& bounds,
                          const display::Display& display) = 0;
 };
 
 // Sets/Gets the activation client on the Window.
 AURA_EXPORT void SetScreenPositionClient(Window* root_window,
                                          ScreenPositionClient* client);
 AURA_EXPORT ScreenPositionClient* GetScreenPositionClient(
     const Window* root_window);
 
 }  // namespace clients
 }  // namespace aura
 
 #endif  // UI_AURA_SCREEN_POSITION_CLIENT_H_