Add ShellAcceleratorController that managers global keyboard accelerators.

ui/aura_shell/global_accelerator_filter.cc

Index: ui/aura_shell/global_accelerator_filter.cc
diff --git a/ui/aura_shell/global_accelerator_filter.cc b/ui/aura_shell/global_accelerator_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4875e1f3169d16aba0fa54c7b4f01219666e9ec1
--- /dev/null
+++ b/ui/aura_shell/global_accelerator_filter.cc
@@ -0,0 +1,58 @@
+// Copyright (c) 2011 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 "ui/aura_shell/global_accelerator_filter.h"
+
+#include "ui/aura/desktop.h"
+#include "ui/aura/event.h"
+#include "ui/aura_shell/shell.h"
+#include "ui/base/accelerator_manager.h"
+#include "ui/base/models/accelerator.h"
+
+namespace {
+const int kModifierFlagMask = (ui::EF_SHIFT_DOWN |
+                               ui::EF_CONTROL_DOWN |
+                               ui::EF_ALT_DOWN);
+}  // namespace
+
+namespace aura_shell {
+namespace internal {
+
+////////////////////////////////////////////////////////////////////////////////
+// GlobalAcceleratorFilter, public:
+
+GlobalAcceleratorFilter::GlobalAcceleratorFilter()
+    : EventFilter(aura::Desktop::GetInstance()) {
+}
+
+GlobalAcceleratorFilter::~GlobalAcceleratorFilter() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// GlobalAcceleratorFilter, EventFilter implementation:
+
+bool GlobalAcceleratorFilter::PreHandleKeyEvent(aura::Window* target,
+                                                aura::KeyEvent* event) {
+  if (event->type() == ui::ET_KEY_PRESSED &&
+      Shell::GetInstance()->accelerator_manager()->Process(
+          ui::Accelerator(event->key_code(),
+                          event->flags() & kModifierFlagMask))) {
+    return true;
+  }
+  return false;
+}
+
+bool GlobalAcceleratorFilter::PreHandleMouseEvent(aura::Window* target,
+                                                  aura::MouseEvent* event) {
+  return false;
+}
+
+ui::TouchStatus GlobalAcceleratorFilter::PreHandleTouchEvent(
+    aura::Window* target,
+    aura::TouchEvent* event) {
+  return ui::TOUCH_STATUS_UNKNOWN;
+}
+
+}  // namespace internal
+}  // namespace aura_shell