Creating default implementation for aura::client::ScreenPositionClient

ui/wm/core/default_screen_position_client.cc

Index: ui/wm/core/default_screen_position_client.cc
diff --git a/ui/wm/core/default_screen_position_client.cc b/ui/wm/core/default_screen_position_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..53ecd25aa795212069226f577e4a0bf5e346d15b
--- /dev/null
+++ b/ui/wm/core/default_screen_position_client.cc
@@ -0,0 +1,59 @@
+// 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.
+
+#include "ui/wm/core/default_screen_position_client.h"
+
+#include "ui/aura/window_tree_host.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/point_conversions.h"
+#include "ui/gfx/screen.h"
+
+namespace wm {
+
+DefaultScreenPositionClient::DefaultScreenPositionClient() {
+}
+
+DefaultScreenPositionClient::~DefaultScreenPositionClient() {
+}
+
+gfx::Point DefaultScreenPositionClient::GetOrigin(
+    const aura::Window* root_window) {
+  gfx::Point origin_in_pixels = root_window->GetHost()->GetBounds().origin();
+  aura::Window* window = const_cast<aura::Window*>(root_window);
+  float scale = gfx::Screen::GetScreenFor(window)->
+       GetDisplayNearestWindow(window).device_scale_factor();
+  return gfx::ToFlooredPoint(gfx::ScalePoint(origin_in_pixels, 1 / scale));
+}
+
+void DefaultScreenPositionClient::ConvertPointToScreen(
+    const aura::Window* window,
+    gfx::Point* point) {
+  const aura::Window* root_window = window->GetRootWindow();
+  aura::Window::ConvertPointToTarget(window, root_window, point);
+  gfx::Point origin = GetOrigin(root_window);
+  point->Offset(origin.x(), origin.y());
+}
+
+void DefaultScreenPositionClient::ConvertPointFromScreen(
+    const aura::Window* window,
+    gfx::Point* point) {
+  const aura::Window* root_window = window->GetRootWindow();
+  gfx::Point origin = GetOrigin(root_window);
+  point->Offset(-origin.x(), -origin.y());
+  aura::Window::ConvertPointToTarget(root_window, window, point);
+}
+
+void DefaultScreenPositionClient::ConvertHostPointToScreen(aura::Window* window,
+                                                           gfx::Point* point) {
+  aura::Window* root_window = window->GetRootWindow();
+  ConvertPointToScreen(root_window, point);
+}
+
+void DefaultScreenPositionClient::SetBounds(aura::Window* window,
+                                            const gfx::Rect& bounds,
+                                            const gfx::Display& display) {
+  window->SetBounds(bounds);
+}
+
+}  // namespace wm