Add always-on-top property to app windows

chrome/browser/extensions/api/app_current_window_internal/app_current_window_internal_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/app_current_window_internal/app_current_window_internal_api.h"
 
 #include "apps/native_app_window.h"
 #include "apps/shell_window.h"
 #include "apps/shell_window_registry.h"
 #include "base/command_line.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/app_current_window_internal.h"
 #include "chrome/common/extensions/api/app_window.h"
 #include "chrome/common/extensions/features/feature_channel.h"
 #include "chrome/common/extensions/features/simple_feature.h"
 #include "extensions/common/switches.h"
 #include "third_party/skia/include/core/SkRegion.h"
 
 namespace SetBounds = extensions::api::app_current_window_internal::SetBounds;
 namespace SetIcon = extensions::api::app_current_window_internal::SetIcon;
 namespace SetInputRegion =
     extensions::api::app_current_window_internal::SetInputRegion;
+namespace SetAlwaysOnTop =
+    extensions::api::app_current_window_internal::SetAlwaysOnTop;
 
 using apps::ShellWindow;
 using extensions::api::app_current_window_internal::Bounds;
 using extensions::api::app_current_window_internal::Region;
 using extensions::api::app_current_window_internal::RegionRect;
 
 namespace extensions {
 
 namespace {
 
@@ skipping 162 matching lines @@
     }
   } else {
     region.reset(NULL);
   }
 
   window->UpdateInputRegion(region.Pass());
 
   return true;
 }
 
+bool AppCurrentWindowInternalSetAlwaysOnTopFunction::RunWithWindow(
+    ShellWindow* window) {
+  if (GetCurrentChannel() > chrome::VersionInfo::CHANNEL_DEV) {

[benwells, 2013/10/09 02:00:50]

Can we use _api_features.json for this check?

[tmdiep, 2013/10/09 06:18:08]

Done.

+    error_ = kDevChannelOnly;
+    return false;
+  }
+
+  scoped_ptr<SetAlwaysOnTop::Params> params(
+      SetAlwaysOnTop::Params::Create(*args_));
+  CHECK(params.get());
+  window->GetBaseWindow()->SetAlwaysOnTop(params->always_on_top);
+  return true;
+}
+
 }  // namespace extensions