Make update over cellular an option for user

chrome/browser/resources/settings/about_page/about_page_browser_proxy.js

Index: chrome/browser/resources/settings/about_page/about_page_browser_proxy.js
diff --git a/chrome/browser/resources/settings/about_page/about_page_browser_proxy.js b/chrome/browser/resources/settings/about_page/about_page_browser_proxy.js
index 2b592acb5631f84a196c887c13c8f205cfcb8abe..b8c3bfbc7462ae7f1810d1e66b00bdd92595833e 100644
--- a/chrome/browser/resources/settings/about_page/about_page_browser_proxy.js
+++ b/chrome/browser/resources/settings/about_page/about_page_browser_proxy.js
@@ -58,6 +58,7 @@ var UpdateStatus = {
   FAILED: 'failed',
   DISABLED: 'disabled',
   DISABLED_BY_ADMIN: 'disabled_by_admin',
+  NEED_PERMISSION_TO_UPDATE: 'need_permission_to_update',
 };
 
 // <if expr="_google_chrome and is_macosx">
@@ -146,6 +147,14 @@ cr.define('settings', function() {
      */
     requestUpdate: function() {},
 
+    /**
+     * Checks for the update with specified version and size and applies over
+     * cellular.

[stevenjb, 2017/05/11 17:20:15]

Maybe provide a brief explanation of why/how size is used and where it comes
from, since it is not obvious.

[weidongg, 2017/05/11 18:09:30]

Done.

+     * @param {string} target_version
+     * @param {string} target_size
+     */
+    requestUpdateOverCellular: function(target_version, target_size) {},
+
     /**
      * @param {!BrowserChannel} channel
      * @param {boolean} isPowerwashAllowed
@@ -213,6 +222,11 @@ cr.define('settings', function() {
       chrome.send('requestUpdate');
     },
 
+    /** @override */
+    requestUpdateOverCellular: function(target_version, target_size) {
+      chrome.send('requestUpdateOverCellular', [target_version, target_size]);
+    },
+
     /** @override */
     setChannel: function(channel, isPowerwashAllowed) {
       chrome.send('setChannel', [channel, isPowerwashAllowed]);