aura: Allow platform to choose how it retrieves ICCProfile.

ui/aura/window_tree_host.cc

 // Copyright (c) 2013 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 "ui/aura/window_tree_host.h"
 
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 51 matching lines @@
   InitCompositor();
   UpdateRootWindowSize(GetBounds().size());
   Env::GetInstance()->NotifyHostInitialized(this);
   window()->Show();
 }
 
 void WindowTreeHost::InitCompositor() {
   compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(window()),
                                GetBounds().size());
   compositor_->SetRootLayer(window()->layer());
-
-  // TODO(hubbe): Get the color space from the *current* monitor and
-  // update it when window is moved or color space configuration changes.
   compositor_->SetDisplayColorSpace(
-      gfx::ICCProfile::FromBestMonitor().GetColorSpace());
+      GetICCProfileForCurrentDisplay().GetColorSpace());
 }
 
 void WindowTreeHost::AddObserver(WindowTreeHostObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void WindowTreeHost::RemoveObserver(WindowTreeHostObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
@@ skipping 226 matching lines @@
     capture_window->ReleaseCapture();
 }
 
 ui::EventProcessor* WindowTreeHost::GetEventProcessor() {
   return event_processor();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowTreeHost, private:
 
+gfx::ICCProfile WindowTreeHost::GetICCProfileForCurrentDisplay() {
+  // TODO(hubbe): Get the color space from the *current* monitor and
+  // update it when window is moved or color space configuration changes.
+  return gfx::ICCProfile::FromBestMonitor();
+}
+
 void WindowTreeHost::MoveCursorToInternal(const gfx::Point& root_location,
                                           const gfx::Point& host_location) {
   last_cursor_request_position_in_host_ = host_location;
   MoveCursorToNative(host_location);
   client::CursorClient* cursor_client = client::GetCursorClient(window());
   if (cursor_client) {
     const display::Display& display =
         display::Screen::GetScreen()->GetDisplayNearestWindow(window());
     cursor_client->SetDisplay(display);
   }
   dispatcher()->OnCursorMovedToRootLocation(root_location);
 }
 
 }  // namespace aura