[CrOS Settings] Record settings change metrics initiated by cr network

This CL adds event fires for the custom 'user-action-setting-change'
in os settings ui to record settings metrics for user action internet
page settings change events that may occur outside of settings.

Bug: 1049830
Change-Id: Icb78e07319fc9d81bdf46a78805037e7185bb096
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063676
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743318}

chrome/browser/resources/settings/chromeos/os_settings_ui/os_settings_ui.js

@@ -295,10 +295,9 @@ Polymer({
   },
 
   /**
-   * @param {!CustomEvent<string>} e
    * @private
    */
-  onSettingChange_(e) {
+  onSettingChange_() {
     settings.recordSettingChange();
   },
 

ui/webui/resources/cr_components/chromeos/network/network_choose_mobile.js

@@ -189,6 +189,7 @@ Polymer({
 
     this.getNetworkConfig_().selectCellularMobileNetwork(
         this.managedProperties.guid, target.value);
+    this.fire('user-action-setting-change');
   },
 });
 })();

ui/webui/resources/cr_components/chromeos/network/network_siminfo.js

@@ -306,6 +306,7 @@ Polymer({
         this.delayUpdateLockEnabled_();
       }
     });
+    this.fire('user-action-setting-change');
   },
 
   /**