Set wallpaper from right click menu in Files app.

third_party/closure_compiler/externs/chrome_extensions.js

 //    SSSSSSSSSSSSSSS TTTTTTTTTTTTTTTTTTTTTTT     OOOOOOOOO     PPPPPPPPPPPPPPPPP
 //  SS:::::::::::::::ST:::::::::::::::::::::T   OO:::::::::OO   P::::::::::::::::P
 // S:::::SSSSSS::::::ST:::::::::::::::::::::T OO:::::::::::::OO P::::::PPPPPP:::::P
 // S:::::S     SSSSSSST:::::TT:::::::TT:::::TO:::::::OOO:::::::OPP:::::P     P:::::P
 // S:::::S            TTTTTT  T:::::T  TTTTTTO::::::O   O::::::O  P::::P     P:::::P
 // S:::::S                    T:::::T        O:::::O     O:::::O  P::::P     P:::::P
 //  S::::SSSS                                                     P::::PPPPPP:::::P
 //   SS::::::SSSSS       This file is generated. To update it,    P:::::::::::::PP
 //     SSS::::::::SS          run roll_closure_compiler.          P::::PPPPPPPPP
 //        SSSSSS::::S                                             P::::P
@@ skipping 9141 matching lines @@
 
 
 /**
  * Installs the given app ID.
  * @param {string} id
  * @param {function(string, string): void=} opt_callback Response callback that
  *     returns two string: (1) an error string (or empty string on success) and
  *     (2) an error code in case of error
  */
 chrome.inlineInstallPrivate.install = function(id, opt_callback) {};
+

[Devlin, 2016/02/17 18:19:36]

We should instead be generating this from the json schema compiler script.

[ryoh, 2016/02/19 05:31:27]

IIRC, this file is generated from the file hosted in our internal repository.
I also send a patch to internal repository.

It seems to take time to propagate the changes from internal to
external(~10days?).
I would like to send this change to M50(the branch will be cut soon),
so I also sent a patch to this file.

[Devlin, 2016/02/19 17:31:53]

The closure compiler isn't automatically rolled - it's done by hand.  So there's
no guarantee on when it'll actually be updated.  The script in the json schema
compiler generates some nice externs for the API that might be slightly better
to copy-paste in here than these (which appear to be handwritten?).  Note also
that in the long-term, we hope to transition these to each having their own
extern file, rather than a single 10k line one - but we don't have to address
that now.

+/**
+ * @const
+ * @see https://goo.gl/7dvJFW
+ */
+ //TODO(ryoh): this entry will be removed when closure compiler rolled up.
+chrome.wallpaper = {};
+
+/**
+ * Sets wallpaper to the image at url or wallpaperData with the specified
+ * layout.
+ * @param {{
+ *    data: ArrayBuffer,
+ *    url: (string|undefined),
+ *    layout: string,
+ *    filename: string,
+ *    thumbnail: (boolean|undefined)
+ *  }} details
+ * @param {function(ArrayBuffer=)} callback
+ *
+ */
+ //TODO(ryoh): this entry will be removed when closure compiler rolled up.
+chrome.wallpaper.setWallpaper;