Move DisplayList to display; add ScreenBase.

ui/display/screen_base.cc

+// 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.
+
+// This has to be before any other includes, else default is picked up.
+// See base/logging for details on this.
+#define NOTIMPLEMENTED_POLICY 5
+
+#include "ui/display/screen_base.h"
+
+#include "ui/display/display_finder.h"
+
+namespace display {
+
+ScreenBase::ScreenBase() {
+  display::Screen::SetScreenInstance(this);
+}
+
+ScreenBase::~ScreenBase() {
+  DCHECK_EQ(this, display::Screen::GetScreen());
+  display::Screen::SetScreenInstance(nullptr);
+}
+
+void ScreenBase::ProcessDisplayChanged(const display::Display& changed_display,
+                                       bool is_primary) {
+  if (display_list_.FindDisplayById(changed_display.id()) ==
+      display_list_.displays().end()) {
+    display_list_.AddDisplay(
+        changed_display, is_primary ? display::DisplayList::Type::PRIMARY
+                                    : display::DisplayList::Type::NOT_PRIMARY);
+    return;
+  }
+  display_list_.UpdateDisplay(
+      changed_display, is_primary ? display::DisplayList::Type::PRIMARY
+                                  : display::DisplayList::Type::NOT_PRIMARY);
+}
+
+gfx::Point ScreenBase::GetCursorScreenPoint() {
+  NOTIMPLEMENTED();
+  return gfx::Point();
+}
+
+bool ScreenBase::IsWindowUnderCursor(gfx::NativeWindow window) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
+gfx::NativeWindow ScreenBase::GetWindowAtScreenPoint(const gfx::Point& point) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+display::Display ScreenBase::GetPrimaryDisplay() const {
+  return *display_list_.GetPrimaryDisplayIterator();
+}
+
+display::Display ScreenBase::GetDisplayNearestWindow(
+    gfx::NativeView view) const {
+  NOTIMPLEMENTED();
+  return *display_list_.GetPrimaryDisplayIterator();
+}
+
+display::Display ScreenBase::GetDisplayNearestPoint(
+    const gfx::Point& point) const {
+  return *display::FindDisplayNearestPoint(display_list_.displays(), point);
+}
+
+int ScreenBase::GetNumDisplays() const {
+  return static_cast<int>(display_list_.displays().size());
+}
+
+std::vector<display::Display> ScreenBase::GetAllDisplays() const {
+  return display_list_.displays();
+}
+
+display::Display ScreenBase::GetDisplayMatching(
+    const gfx::Rect& match_rect) const {
+  const display::Display* match = display::FindDisplayWithBiggestIntersection(
+      display_list_.displays(), match_rect);
+  return match ? *match : GetPrimaryDisplay();
+}
+
+void ScreenBase::AddObserver(display::DisplayObserver* observer) {
+  display_list_.AddObserver(observer);
+}
+
+void ScreenBase::RemoveObserver(display::DisplayObserver* observer) {
+  display_list_.RemoveObserver(observer);
+}
+
+}  // namespace display