Keep root_location to be in pixels and display coordinates in WS.

services/ui/ws/platform_display_default.h

 // 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.
 
 #ifndef SERVICES_UI_WS_PLATFORM_DISPLAY_DEFAULT_H_
 #define SERVICES_UI_WS_PLATFORM_DISPLAY_DEFAULT_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "services/ui/display/viewport_metrics.h"
 #include "services/ui/ws/frame_generator.h"
 #include "services/ui/ws/platform_display.h"
 #include "services/ui/ws/platform_display_delegate.h"
 #include "services/ui/ws/server_window.h"
 #include "ui/platform_window/platform_window_delegate.h"
 
 namespace ui {
 
 class EventSink;
 class ImageCursors;
-class LocatedEvent;
 class PlatformWindow;
 
 namespace ws {
 
 // PlatformDisplay implementation that connects to a PlatformWindow and
 // FrameGenerator for Chrome OS.
 class PlatformDisplayDefault : public PlatformDisplay,
                                public ui::PlatformWindowDelegate {
  public:
   // |image_cursors| may be null, for example on Android or in tests.
@@ skipping 12 matching lines @@
   void SetCapture() override;
   void ReleaseCapture() override;
   void SetCursor(const ui::CursorData& cursor) override;
   void UpdateTextInputState(const ui::TextInputState& state) override;
   void SetImeVisibility(bool visible) override;
   void UpdateViewportMetrics(const display::ViewportMetrics& metrics) override;
   gfx::AcceleratedWidget GetAcceleratedWidget() const override;
   FrameGenerator* GetFrameGenerator() override;
 
  private:
-  // Update the root_location of located events to be relative to the origin
-  // of this display. For example, if the origin of this display is (1800, 0)
-  // and the location of the event is (100, 200) then the root_location will be
-  // updated to be (1900, 200).
-  // TODO(riajiang): This is totally broken with HDPI.
-  void UpdateEventRootLocation(ui::LocatedEvent* event);
-
   // ui::PlatformWindowDelegate:
   void OnBoundsChanged(const gfx::Rect& new_bounds) override;
   void OnDamageRect(const gfx::Rect& damaged_region) override;
   void DispatchEvent(ui::Event* event) override;
   void OnCloseRequest() override;
   void OnClosed() override;
   void OnWindowStateChanged(ui::PlatformWindowState new_state) override;
   void OnLostCapture() override;
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget,
                                     float device_scale_factor) override;
@@ skipping 11 matching lines @@
   std::unique_ptr<ui::PlatformWindow> platform_window_;
   gfx::AcceleratedWidget widget_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformDisplayDefault);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_PLATFORM_DISPLAY_DEFAULT_H_