Add reference to -webkit-app-region CSS style for no-frame windows.

chrome/common/extensions/api/app_window.idl

Index: chrome/common/extensions/api/app_window.idl
diff --git a/chrome/common/extensions/api/app_window.idl b/chrome/common/extensions/api/app_window.idl
index 227c38f36e732ec8fecc291b63d9966d62eef28d..67eae86c5716d12d57afbde21df3aaee6bb08e79 100644
--- a/chrome/common/extensions/api/app_window.idl
+++ b/chrome/common/extensions/api/app_window.idl
@@ -69,7 +69,11 @@ namespace app.window {
     // Type of window to create.
     [nodoc] WindowType? type;
 
-    // Frame type: 'none' or 'chrome' (defaults to 'chrome').
+    // Frame type: 'none' or 'chrome' (defaults to 'chrome'). For 'none',
+    // the -webkit-app-region CSS property can be used to apply draggability

[not at google - send to devlin, 2013/09/16 18:25:40]

also apply to the ones above here: 'none', 'chrome', and -webkit-app-region.

[Greg Billock, 2013/09/16 18:49:52]

Done.

+    // to the app's window. <code>-webkit-app-region: drag</code> can be
+    // used to mark regions draggable. <code>no-drag</code> can be used to
+    // disable this style on nested elements.
     DOMString? frame;
 
     // Size and position of the content in the window (excluding the titlebar).