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..c18d7bb7a4555567e6483141235cdedf7f97f312 100644
--- a/chrome/common/extensions/api/app_window.idl
+++ b/chrome/common/extensions/api/app_window.idl
@@ -69,7 +69,9 @@ 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

[scheib, 2013/09/15 04:35:15]

.
This appears to be the only place we will have this style documented, so please
add a bit more text here to make its usage clear. e.g. add:

"""
"-webkit-app-region: drag" can be used to mark regions draggable. "no-drag" can
be used to disable this style on nested elements.
"""

[Greg Billock, 2013/09/16 17:47:19]

Yeah, I was talking to a developer who found this hard to find. Adding your
additional explanation.

+    // to the app's window.
     DOMString? frame;
 
     // Size and position of the content in the window (excluding the titlebar).