[CrOS Settings] Add recordSettingChange() metric in bluetooth settings

This CL adds user action recordSettingChange() calls in instances in
OS settings related to the bluetooth page settings that the user
can change.

Change-Id: Id394d94dd7bb8f29de8dcadbfae0a5f6f2146c84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064607Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742816}

chrome/browser/resources/settings/chromeos/bluetooth_page/BUILD.gn

@@ -35,6 +35,7 @@ js_library("bluetooth_page") {
 js_library("bluetooth_subpage") {
   deps = [
     ":bluetooth_system_on_extensions",
+    "..:metrics_recorder",
     "..:os_route",
     "../..:router",
     "//ui/webui/resources/cr_components/chromeos:bluetooth_dialog",

chrome/browser/resources/settings/chromeos/bluetooth_page/bluetooth_subpage.html

@@ -11,6 +11,7 @@
 <link rel="import" href="../os_route.html">
 <link rel="import" href="../../router.html">
 <link rel="import" href="../../settings_shared_css.html">
+<link rel="import" href="../metrics_recorder.html">
 <link rel="import" href="bluetooth_device_list_item.html">
 
 <dom-module id="settings-bluetooth-subpage">

chrome/browser/resources/settings/chromeos/bluetooth_page/bluetooth_subpage.js

@@ -409,6 +409,7 @@ Polymer({
         this.$.deviceDialog.close();
       }
     });
+    settings.recordSettingChange();
   },
 
   /**
@@ -423,6 +424,7 @@ Polymer({
             chrome.runtime.lastError.message);
       }
     });
+    settings.recordSettingChange();
   },
 
   /**
@@ -437,6 +439,7 @@ Polymer({
             chrome.runtime.lastError.message);
       }
     });
+    settings.recordSettingChange();
   },
 
   /** @private */