Refactor screen/monitor so that gfx::Screen returns monitor object.

ui/aura/monitor_aura.cc

+// 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/aura/monitor_aura.h"
+
+#include "ui/gfx/monitor.h"
+
+namespace aura {
+
+MonitorAura::MonitorAura() : device_scale_factor_(1.0f) {
+}
+
+MonitorAura::MonitorAura(const gfx::Rect& bounds)
+    : bounds_(bounds), device_scale_factor_(1.0f) {
+}
+
+MonitorAura::~MonitorAura() {
+}
+
+void MonitorAura::CopyTo(gfx::Monitor* monitor_out) const {
+  // TODO(oshima): For m19, the origin of work area/monitor bounds for
+  // views/aura is always (0,0) because it's simple and enough. Fix this when
+  // real multi monitor support is implemented.
+  gfx::Rect bounds(bounds_.size());
+  monitor_out->set_bounds(bounds);
+  bounds.Inset(work_area_insets_);
+  monitor_out->set_work_area(bounds);
+  monitor_out->set_device_scale_factor(device_scale_factor_);
+}
+
+}  // namespace aura