MD Settings: Fix subpage navigation focus for bluetooth+internet

chrome/browser/resources/settings/internet_page/internet_detail_page.js

Index: chrome/browser/resources/settings/internet_page/internet_detail_page.js
diff --git a/chrome/browser/resources/settings/internet_page/internet_detail_page.js b/chrome/browser/resources/settings/internet_page/internet_detail_page.js
index ef74fd58e9a3f81d343047e79d349016b95633d8..4a6677f6cb427451df97d1e9dde27b8382bf3026 100644
--- a/chrome/browser/resources/settings/internet_page/internet_detail_page.js
+++ b/chrome/browser/resources/settings/internet_page/internet_detail_page.js
@@ -144,6 +144,9 @@ Polymer({
    */
   networksChangedListener_: null,
 
+  /** @private {boolean} */
+  didSetFocus_: false,
+
   /**
    * settings.RouteObserverBehavior
    * @param {!settings.Route} route
@@ -180,10 +183,22 @@ Polymer({
       ConnectionState: CrOnc.ConnectionState.NOT_CONNECTED,
       Name: {Active: name},
     };
+    this.didSetFocus_ = false;
     this.getNetworkDetails_();
   },
 
   /** @private */
+  maybeSetFocus_: function() {
+    if (this.didSetFocus_)
+      return;
+    this.didSetFocus_ = true;
+    var button = this.$$('#buttonDiv .primary-button:not([hidden])');
+    if (!button)
+      button = this.$$('#buttonDiv .secondary-button:not([hidden])');
+    button.focus();
+  },
+
+  /** @private */
   close_: function() {
     // Delay navigating until the next render frame to allow other subpages to
     // load first.
@@ -285,6 +300,7 @@ Polymer({
       return;
     }
     this.networkProperties = properties;
+    this.maybeSetFocus_();
   },
 
   /**
@@ -305,6 +321,7 @@ Polymer({
       Connectable: state.Connectable,
       ConnectionState: state.ConnectionState,
     };
+    this.maybeSetFocus_();
   },
 
   /**
@@ -549,7 +566,8 @@ Polymer({
     this.networkingPrivate.startActivate(this.guid);
   },
 
-  /** @const {string} */ CR_EXPAND_BUTTON_TAG: 'CR-EXPAND-BUTTON',
+  /** @const {string} */
+  CR_EXPAND_BUTTON_TAG: 'CR-EXPAND-BUTTON',
 
   /**
    * @param {Event} event