[MD settings] adding homepage url input

chrome/browser/resources/settings/appearance_page/appearance_page.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
-<link rel="import" href="chrome://md-settings/checkbox/checkbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-button/paper-radio-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-group/paper-radio-group.html">
+<link rel="import" href="chrome://md-settings/checkbox/checkbox.html">
 
 <dom-module id="cr-settings-appearance-page">
   <link rel="import" type="css"
       href="chrome://md-settings/settings_page/settings_page.css">
   <link rel="import" type="css"
       href="chrome://md-settings/appearance_page/appearance_page.css">
   <link rel="import" type="css" href="chrome://resources/css/widgets.css">
   <link rel="import" href="chrome://resources/html/action_link.html">
   <template>
     <div id="action-container">
@@ skipping 11 matching lines @@
     </cr-settings-checkbox>
     <template is="dom-if" if="{{prefs.browser.show_home_button.value}}">
       <div class="radio-container">
         <paper-radio-group
             selected="{{isNewTabPageString_}}">
           <paper-radio-button
               name="true">[[i18n_.homePageNtp]]</paper-radio-button>
           <paper-radio-button
               name="false">[[i18n_.openThisPage]]</paper-radio-button>
         </paper-radio-group>
+        <div class="radio-extended">
+          <paper-input no-label-float
+              value="{{homepage_}}"

[Dan Beam, 2015/09/17 17:13:48]

why can't this just be: value="{{prefs.homepage.value}}" and remove homepage_?

[dschuyler, 2015/09/17 18:02:41]

We can do that :)  This next patch uses prefs.homepage.value
directly.  Now edits are done immediately.
So there's no more need for a 'submit this change' button (since
changes happen directly).

Done.

[dschuyler, 2015/09/17 18:28:36]

Also, there's a DCHECK about the url being valid that I'd
need to look into further.  Since the url is being interactively
created, it may be temporarily invalid while editing.

+              label="[[i18n_.onStartupEnterUrl]]">
+          </paper-input>

[Dan Beam, 2015/09/17 17:13:48]

this can be 2 lines instead of 4

[dschuyler, 2015/09/17 18:02:41]

Done.

+          <paper-button
+              on-tap="onSetHomepageTap_">[[i18n_.changeHomePage]]</paper-button>
+        </div>
       </div>
     </template>
     <cr-settings-checkbox pref="{{prefs.bookmark_bar.show_on_all_tabs}}"
         i18n-values="label:showBookmarksBar">
     </cr-settings-checkbox>
   </template>
   <script src="appearance_page.js"></script>
 </dom-module>