Refactoring display configuration state to allow generic state objects

ui/display/chromeos/native_display_delegate.h

Index: ui/display/chromeos/native_display_delegate.h
diff --git a/ui/display/chromeos/native_display_delegate.h b/ui/display/chromeos/native_display_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..bacedfd6d9c31d1a5b8d4b4021314821efe551f2
--- /dev/null
+++ b/ui/display/chromeos/native_display_delegate.h
@@ -0,0 +1,81 @@
+// Copyright 2014 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 UI_DISPLAY_CHROMEOS_NATIVE_DISPLAY_DELEGATE_H_
+#define UI_DISPLAY_CHROMEOS_NATIVE_DISPLAY_DELEGATE_H_
+
+#include "ui/display/display_constants.h"
+#include "ui/display/display_export.h"
+
+namespace gfx {
+class Point;
+class Size;
+}
+
+namespace ui {
+class DisplayMode;
+class DisplaySnapshot;
+
+class NativeDisplayObserver;
+
+// Interface for classes that perform display configuration actions on behalf
+// of OutputConfigurator.
+class DISPLAY_EXPORT NativeDisplayDelegate {
+ public:
+  virtual ~NativeDisplayDelegate() {}
+
+  virtual void Initialize() = 0;
+
+  // Grabs and refreshes any display server related resources. Must be balanced
+  // by a call to UngrabServer().
+  virtual void GrabServer() = 0;
+
+  // Released the display server and any resources allocated by GrabServer().
+  virtual void UngrabServer() = 0;
+
+  // Flushes all pending requests and waits for replies.
+  virtual void SyncWithServer() = 0;
+
+  // Sets the window's background color to |color_argb|.
+  virtual void SetBackgroundColor(uint32 color_argb) = 0;
+
+  // Enables DPMS and forces it to the "on" state.
+  virtual void ForceDPMSOn() = 0;
+
+  // Returns information about the current outputs. This method may block for
+  // 60 milliseconds or more.
+  // NativeDisplayDelegate maintains ownership of the ui::DisplaySnapshot
+  // pointers.
+  virtual std::vector<ui::DisplaySnapshot*> GetOutputs() = 0;
+
+  // Adds |mode| to |output|. |mode| must be a valid display mode pointer.
+  virtual void AddMode(const ui::DisplaySnapshot& output,
+                       const ui::DisplayMode* mode) = 0;
+
+  // Configures the display represented by |output| to use |mode| and positions
+  // the display to |origin| in the framebuffer. |mode| can be NULL, which
+  // represents disabling the display. Returns true on success.
+  virtual bool Configure(const ui::DisplaySnapshot& output,
+                         const ui::DisplayMode* mode,
+                         const gfx::Point& origin) = 0;
+
+  // Called to set the frame buffer (underlying XRR "screen") size.
+  virtual void CreateFrameBuffer(const gfx::Size& size) = 0;
+
+  // Gets HDCP state of output.
+  virtual bool GetHDCPState(const ui::DisplaySnapshot& output,
+                            ui::HDCPState* state) = 0;
+
+  // Sets HDCP state of output.
+  virtual bool SetHDCPState(const ui::DisplaySnapshot& output,
+                            ui::HDCPState state) = 0;
+
+  virtual void AddObserver(NativeDisplayObserver* observer) = 0;
+
+  virtual void RemoveObserver(NativeDisplayObserver* observer) = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_DISPLAY_CHROMEOS_NATIVE_DISPLAY_DELEGATE_H_