ash: Use floating point precision for laser pointer.

ash/laser/laser_pointer_view.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 ASH_LASER_LASER_POINTER_VIEW_H_
 #define ASH_LASER_LASER_POINTER_VIEW_H_
 
 #include <deque>
 #include <memory>
 #include <unordered_map>
 
 #include "ash/laser/laser_pointer_points.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/ipc/compositor_frame.mojom.h"
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/resources/texture_mailbox.h"
 #include "cc/surfaces/compositor_frame_sink_support.h"
 #include "cc/surfaces/compositor_frame_sink_support_client.h"
 #include "cc/surfaces/local_surface_id_allocator.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "ui/views/view.h"
 
 namespace aura {
 class Window;
 }
 
 namespace gfx {
 class GpuMemoryBuffer;
-class Point;
+class PointF;
 }
 
 namespace views {
 class Widget;
 }
 
 namespace ash {
 struct LaserResource;
 
 // LaserPointerView displays the palette tool laser pointer. It draws the laser,
 // which consists of a point where the mouse cursor should be, as well as a
 // trail of lines to help users track.
 class LaserPointerView : public views::View,
                          public cc::mojom::MojoCompositorFrameSink,
                          public cc::CompositorFrameSinkSupportClient {
  public:
   LaserPointerView(base::TimeDelta life_duration, aura::Window* root_window);
   ~LaserPointerView() override;
 
-  void AddNewPoint(const gfx::Point& new_point);
+  void AddNewPoint(const gfx::PointF& new_point);
   void UpdateTime();
   void Stop();
 
   // Overridden from cc::mojom::MojoCompositorFrameSink:
   void SetNeedsBeginFrame(bool needs_begin_frame) override;
   void SubmitCompositorFrame(const cc::LocalSurfaceId& local_surface_id,
                              cc::CompositorFrame frame) override;
   void EvictFrame() override;
   void Require(const cc::LocalSurfaceId& local_surface_id,
                const cc::SurfaceSequence& sequence) override;
@@ skipping 33 matching lines @@
   std::unordered_map<int, std::unique_ptr<LaserResource>> resources_;
   std::deque<std::unique_ptr<LaserResource>> returned_resources_;
   base::WeakPtrFactory<LaserPointerView> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LaserPointerView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_LASER_LASER_POINTER_VIEW_H_