Move app.window API implementation to extensions

extensions/common/switches.cc

Index: extensions/common/switches.cc
diff --git a/extensions/common/switches.cc b/extensions/common/switches.cc
index afa05b18da0c121e5cb51609520717e406a338bc..cdccdae50ae21cf58d962db708b5f06a294852ad 100644
--- a/extensions/common/switches.cc
+++ b/extensions/common/switches.cc
@@ -26,12 +26,15 @@ const char kEmbeddedExtensionOptions[] = "embedded-extension-options";
 // Show apps windows after the first paint. Windows will be shown significantly
 // later for heavy apps loading resources synchronously but it will be
 // insignificant for apps that load most of their resources asynchronously.
-const char kEnableAppsShowOnFirstPaint[]    = "enable-apps-show-on-first-paint";
+const char kEnableAppsShowOnFirstPaint[] = "enable-apps-show-on-first-paint";
 
 // Hack so that feature switch can work with about_flags. See
 // kEnableScriptsRequireAction.
 const char kEnableAppView[] = "enable-app-view";
 
+// Enables the <window-controls> tag in platform apps.
+const char kEnableAppWindowControls[] = "enable-app-window-controls";
+
 // Hack so that feature switch can work with about_flags. See
 // kEnableScriptsRequireAction.
 const char kEnableEmbeddedExtensionOptions[] =