Makes Screen functions take a const gfx::NativeView

ash/display/screen_ash.cc

 // Copyright 2014 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 "ash/display/screen_ash.h"
 
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/shelf/shelf_widget.h"
 #include "ash/common/wm/root_window_finder.h"
 #include "ash/display/window_tree_host_manager.h"
@@ skipping 31 matching lines @@
   gfx::Point GetCursorScreenPoint() override { return gfx::Point(); }
   bool IsWindowUnderCursor(gfx::NativeWindow window) override { return false; }
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override {
     return NULL;
   }
   int GetNumDisplays() const override { return display_list_.size(); }
   std::vector<display::Display> GetAllDisplays() const override {
     return display_list_;
   }
   display::Display GetDisplayNearestWindow(
-      gfx::NativeView view) const override {
+      const gfx::NativeView view) const override {
     return primary_display_;
   }
   display::Display GetDisplayNearestPoint(
       const gfx::Point& point) const override {
     return *display::FindDisplayNearestPoint(display_list_, point);
   }
   display::Display GetDisplayMatching(
       const gfx::Rect& match_rect) const override {
     const display::Display* matching =
         display::FindDisplayWithBiggestIntersection(display_list_, match_rect);
@@ skipping 45 matching lines @@
 
 int ScreenAsh::GetNumDisplays() const {
   return GetDisplayManager()->GetNumDisplays();
 }
 
 std::vector<display::Display> ScreenAsh::GetAllDisplays() const {
   return GetDisplayManager()->active_display_list();
 }
 
 display::Display ScreenAsh::GetDisplayNearestWindow(
-    gfx::NativeView window) const {
+    const gfx::NativeView window) const {
   if (!window)
     return GetPrimaryDisplay();
   const aura::Window* root_window = window->GetRootWindow();
   if (!root_window)
     return GetPrimaryDisplay();
   const RootWindowSettings* rws = GetRootWindowSettings(root_window);
   int64_t id = rws->display_id;
   // if id is |kInvaildDisplayID|, it's being deleted.
   DCHECK(id != display::Display::kInvalidDisplayID);
   if (id == display::Display::kInvalidDisplayID)
@@ skipping 59 matching lines @@
 }
 
 // static
 void ScreenAsh::CreateScreenForShutdown() {
   delete screen_for_shutdown;
   screen_for_shutdown = new ScreenForShutdown(display::Screen::GetScreen());
   display::Screen::SetScreenInstance(screen_for_shutdown);
 }
 
 }  // namespace ash