- Move DisplayManager and DisplayChangeObserverX11 from aura

  to ash.DisplayManager/DisplayChangeObserverX11 are in aura for
  historical reason, but they no longer have to be in aura.
  * Remove SingleDisplayManager as it's no longer necessary.
  * Rename MultipleDisplayManager and consolidate into DisplayManager.
  * Remove DisplayManager from desktop environment. Screen
    information is managed by platform in desktop environment, and
    should be provided via gfx::Screen implementation.

- Move DisplayObserver to ui/gfx. This should be consolicated
  with other similar features such as WorkAreaWatcherObserver/
  DisplaySettingsProvider. It's tracked in crbug.com/122863.

- Misc cleanups
  * Test should use test_support_ash instead of including
    individual files.
  * Use TestScreen where appropriate.

BUG=159710, 122863
TEST=none

Review URL: https://chromiumcodereview.appspot.com/11363124

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167639 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 33 insertions, 0 deletions

diff --git a/ui/gfx/display_observer.h b/ui/gfx/display_observer.h
new file mode 100644
index 0000000..85a4086
--- /dev/null
+++ b/ui/gfx/display_observer.h
@@ -0,0 +1,33 @@
+// 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.
+
+#ifndef UI_GFX_DISPLAY_OBSERVER_H_
+#define UI_GFX_DISPLAY_OBSERVER_H_
+
+#include "ui/base/ui_export.h"
+
+namespace gfx {
+class Display;
+
+// Observers for display configuration changes.
+// TODO(oshima): consolidate |WorkAreaWatcherObserver| and
+// |DisplaySettingsProvier|. crbug.com/122863.
+class UI_EXPORT DisplayObserver {
+ public:
+  // Called when the |display|'s bound has changed.
+  virtual void OnDisplayBoundsChanged(const Display& display) = 0;
+
+  // Called when |new_display| has been added.
+  virtual void OnDisplayAdded(const Display& new_display) = 0;
+
+  // Called when |old_display| has been removed.
+  virtual void OnDisplayRemoved(const Display& old_display) = 0;
+
+ protected:
+  virtual ~DisplayObserver();
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_DISPLAY_OBSERVER_H_