Set LauncherID as a Window's Property

Currently, we need to query all LauncherItemController when we need to get window's id.
This is very inefficient way.
Instead, LauncherID associated with window is set as a window property.

R=sky@chromium.org
BUG=NONE
TEST=browser_tests --gtest_filter=*.MatchingLauncherIDandActiveTab

Review URL: https://codereview.chromium.org/27335006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235496 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 56 insertions, 0 deletions

diff --git a/ash/shelf/shelf_util.cc b/ash/shelf/shelf_util.cc
new file mode 100644
index 0000000..2e86814
--- /dev/null
+++ b/ash/shelf/shelf_util.cc
@@ -0,0 +1,28 @@
+// Copyright 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.
+
+#include "ash/shelf/shelf_util.h"
+
+#include "ui/aura/window.h"
+#include "ui/aura/window_property.h"
+
+DECLARE_WINDOW_PROPERTY_TYPE(ash::LauncherID);
+
+namespace ash {
+
+DEFINE_LOCAL_WINDOW_PROPERTY_KEY(LauncherID, kLauncherID, 0);
+
+void SetLauncherIDForWindow(LauncherID id, aura::Window* window) {
+  if (!window)
+    return;
+
+  window->SetProperty(kLauncherID, id);
+}
+
+LauncherID GetLauncherIDForWindow(aura::Window* window) {
+  DCHECK(window);
+  return window->GetProperty(kLauncherID);
+}
+
+}  // namespace ash
diff --git a/ash/shelf/shelf_util.h b/ash/shelf/shelf_util.h
new file mode 100644
index 0000000..30953a7
--- /dev/null
+++ b/ash/shelf/shelf_util.h
@@ -0,0 +1,28 @@
+// Copyright 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 ASH_SHELF_SHELF_UTIL_H_
+#define ASH_SHELF_SHELF_UTIL_H_
+
+#include "ash/ash_export.h"
+#include "ash/launcher/launcher_types.h"
+
+namespace aura {
+class Window;
+}
+
+namespace ash {
+
+// Associates LauncherItem of |id| with specified |window|.
+ASH_EXPORT void SetLauncherIDForWindow(LauncherID id, aura::Window* window);
+
+// Returns the id of the LauncherItem associated with the specified |window|,
+// or 0 if there isn't one.
+// Note: Window of a tabbed browser will return the |LauncherID| of the
+// currently active tab.
+ASH_EXPORT LauncherID GetLauncherIDForWindow(aura::Window* window);
+
+}  // namespace ash
+
+#endif  // ASH_SHELF_SHELF_UTIL_H_