Basic display management for mus

components/mus/ws/platform_screen.h

Index: components/mus/ws/platform_screen.h
diff --git a/components/mus/ws/platform_screen.h b/components/mus/ws/platform_screen.h
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+// 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.
+
+#ifndef COMPONENTS_MUS_WS_PLATFORM_SCREEN_H_
+#define COMPONENTS_MUS_WS_PLATFORM_SCREEN_H_
+
+#include <stdint.h>
+
+#include "base/callback.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace mus {
+namespace ws {
+
+// PlatformScreen provides the necessary functionality to configure all
+// attached physical displays.
+class PlatformScreen {
+ public:
+  virtual ~PlatformScreen() {}
+
+  // Creates a PlatformScreen instance.
+  static std::unique_ptr<PlatformScreen> Create();
+
+  // Initializes platform specific screen resources.
+  virtual void Init() = 0;
+
+  using ConfiguredDisplayCallback =
+      base::Callback<void(int64_t, const gfx::Rect&)>;
+
+  // ConfigurePhysicalDisplay() configures a single physical display and returns
+  // its id and bounds for it via |callback|.
+  virtual void ConfigurePhysicalDisplay(
+      const ConfiguredDisplayCallback& callback) = 0;
+};
+
+}  // namespace ws
+}  // namespace mus
+
+#endif  // COMPONENTS_MUS_WS_PLATFORM_SCREEN_H_