Refactor and move ash independent nested accelerator code to ui/wm/core

ui/wm/core/nested_accelerator_delegate.h

+// 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_WM_CORE_NESTED_ACCELERATOR_DELEGATE_H_
+#define UI_WM_CORE_NESTED_ACCELERATOR_DELEGATE_H_
+
+namespace ui {
+class KeyEvent;
+}
+
+namespace wm {
+
+// A delegate interface that implements the behavior of nested accelerator
+// handling.
+class NestedAcceleratorDelegate {
+ public:
+  virtual ~NestedAcceleratorDelegate() {}
+
+  // If the key event should be ignored now and instead be reposted so that next
+  // event loop.
+  virtual bool ShouldProcessEventNow(const ui::KeyEvent& key_event) = 0;
+
+  // Attempts to process an accelerator for the key-event.
+  // Returns whether an accelerator was triggered and processed.
+  virtual bool ProcessEvent(const ui::KeyEvent& key_event) = 0;
+};
+
+}  // namespace wm
+
+#endif  // UI_WM_CORE_NESTED_ACCELERATOR_DELEGATE_H_