Transparent apps support

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 2d3037b967d4b9990c32ec243693aff8974e09b5..70ec4ba6f0928bb41d2e3269c2da19920f1a8050 100644
--- a/chrome/common/extensions/api/app_window.idl
+++ b/chrome/common/extensions/api/app_window.idl
@@ -48,9 +48,14 @@ namespace app.window {
     // Window type: 'shell' (the default) is the only currently supported value.
     DOMString? type;
 
-    // Frame type: 'none' or 'chrome' (defaults to 'chrome').
+    // Frame type: 'none', 'chrome' (default), 'experimental-html'.
+    // The value 'experimental-html' requires experimental API permission.

[jeremya, 2012/11/11 23:22:43]

I'd rather we don't document the 'experimental-html' option here.

[Bernie, 2012/12/18 21:08:36]

Ok, reverted this chunk.

     DOMString? frame;
 
+    // Enable window background transparency.
+    // Only supported in ash. Requires experimental API permission.
+    boolean? transparentBackground;
+
     // If true, the window will be created in a hidden state. Call show() on
     // the window to show it once it has been created. Defaults to false.
     boolean? hidden;