Add always-on-top property to app windows

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

Index: chrome/browser/extensions/api/app_current_window_internal/app_current_window_internal_api.cc
diff --git a/chrome/browser/extensions/api/app_current_window_internal/app_current_window_internal_api.cc b/chrome/browser/extensions/api/app_current_window_internal/app_current_window_internal_api.cc
index f5cdf91f6ff0cd226e5e9861d5ed23d9eb5d2cb5..7bc26ca56151cd0e0043f69d1d10d886348900d8 100644
--- a/chrome/browser/extensions/api/app_current_window_internal/app_current_window_internal_api.cc
+++ b/chrome/browser/extensions/api/app_current_window_internal/app_current_window_internal_api.cc
@@ -20,6 +20,8 @@ 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;
@@ -202,4 +204,18 @@ bool AppCurrentWindowInternalSetInputRegionFunction::RunWithWindow(
   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