Add an update warning for downloading over mobile data

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

Index: chrome/browser/resources/settings/about_page/update_warning_dialog.js
diff --git a/chrome/browser/resources/settings/about_page/update_warning_dialog.js b/chrome/browser/resources/settings/about_page/update_warning_dialog.js
index 1060fa4f02bce2c5b832d63f3f0ac5150a09a962..a73c91aac7bfa27361644dfe34851d3f9e3d4558 100644
--- a/chrome/browser/resources/settings/about_page/update_warning_dialog.js
+++ b/chrome/browser/resources/settings/about_page/update_warning_dialog.js
@@ -12,6 +12,9 @@ Polymer({
 
   behaviors: [I18nBehavior],
 
+  /** @private {?settings.AboutPageBrowserProxy} */
+  browserProxy_: null,
+
   /** @override */
   ready: function() {
     this.browserProxy_ = settings.AboutPageBrowserProxyImpl.getInstance();
@@ -24,22 +27,26 @@ Polymer({
 
   /** @private */
   onCancelTap_: function() {
-    // TODO(weidongg): implement the real behaviors here.
     this.$.dialog.close();
   },
 
   /** @private */
   onContinueTap_: function() {
-    // TODO(weidongg): implement the real behaviors here.
+    this.browserProxy_.requestUpdateOverCellular(this.target_version,
+                                                 this.target_size);
     this.$.dialog.close();
   },
 
   /**
-   * @param {string} updateSizeMb Size of the update in megabytes.
+   * @param {string} updateSize Size of the update in bytes.
    * @private
    */
-  setUpdateWarningMessage: function(updateSizeMb) {
-     this.$$("#update-warning-message").innerHTML =
-         this.i18n("aboutUpdateWarningMessage", updateSizeMb);
+  setUpdateWarningMessage: function(version, size) {
+    this.target_version = version;
+    this.target_size = size;
+    this.$$("#update-warning-message").innerHTML =
+        this.i18n("aboutUpdateWarningMessage",
+                  // Convert bytes to megabytes
+                  Math.floor(Number(size) / (1024 * 1024)));
   },
 });