Add GTK support for global Extension Commands

chrome/browser/extensions/global_shortcut_listener_gtk.h

+// Copyright (c) 2013 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 CHROME_BROWSER_EXTENSIONS_GLOBAL_SHORTCUT_LISTENER_GTK_H_
+#define CHROME_BROWSER_EXTENSIONS_GLOBAL_SHORTCUT_LISTENER_GTK_H_
+
+#include <gtk/gtk.h>
+#include <set>
+
+#include "base/lazy_instance.h"
+#include "chrome/browser/extensions/global_shortcut_listener.h"
+#include "ui/base/gtk/gtk_signal.h"
+
+namespace extensions {
+
+// Linux-specific implementation of the GlobalShortcutListener class that
+// listens for global shortcuts. Handles basic keyboard intercepting and
+// forwards its output to the base class for processing.
+class GlobalShortcutListenerGtk : public GlobalShortcutListener {
+ public:
+  virtual ~GlobalShortcutListenerGtk();
+
+  virtual void StartListening() OVERRIDE;
+  virtual void StopListening() OVERRIDE;
+
+ private:
+  friend struct base::DefaultLazyInstanceTraits<GlobalShortcutListenerGtk>;
+
+  GlobalShortcutListenerGtk();
+
+  // Register an |accelerator| with the particular |observer|.
+  virtual void RegisterAccelerator(
+      const ui::Accelerator& accelerator,
+      GlobalShortcutListener::Observer* observer) OVERRIDE;
+  // Unregister an |accelerator| with the particular |observer|.
+  virtual void UnregisterAccelerator(
+      const ui::Accelerator& accelerator,
+      GlobalShortcutListener::Observer* observer) OVERRIDE;
+  // Callback for XEvents of the default root window.

[Finnur, 2013/09/27 10:35:02]

nit: Line break above this line.

[zhchbin, 2013/09/27 13:47:20]

Done.

+  CHROMEG_CALLBACK_1(GlobalShortcutListenerGtk, GdkFilterReturn,
+                     OnXEvent, GdkXEvent*, GdkEvent*);
+
+  // Whether this object is listening for global shortcuts.
+  bool is_listening_;
+
+  // A set of registered accelerators.
+  typedef std::set<ui::Accelerator> RegisteredHotKeys;
+  RegisteredHotKeys registered_hot_keys_;
+
+  DISALLOW_COPY_AND_ASSIGN(GlobalShortcutListenerGtk);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_GLOBAL_SHORTCUT_LISTENER_GTK_H_