linux_aura: Port GtkKeybindingsHandler to Aura.

content/public/browser/keybinding_handler_factory_aurax11.cc

+// Copyright (c) 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.
+
+#include "content/public/browser/keybinding_handler_factory_aurax11.h"
+
+namespace content {
+namespace {
+
+// Optional keybinding handler factory. Weak pointer; this system is usually
+// deleted as the LinuxUI object.
+content::KeybindingHandlerFactoryAuraX11* keybinding_handler_factory_ = 0;
+
+}  // namespace
+
+// static
+void KeybindingHandlerFactoryAuraX11::SetFactory(
+    KeybindingHandlerFactoryAuraX11* factory) {
+  keybinding_handler_factory_ = factory;
+}
+
+// static
+KeybindingHandlerAuraX11* KeybindingHandlerFactoryAuraX11::Build() {
+  if (keybinding_handler_factory_)
+    return keybinding_handler_factory_->Create();
+
+  return 0;
+}
+
+}  // namespace content