MD Downloads: wrap some <paper-buttons>s in <template is="dom-if">

chrome/browser/resources/md_downloads/item.html

 <link rel="import" href="chrome://resources/html/action_link.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://resources/html/load_time_data.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.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-material/paper-material.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-progress/paper-progress.html">
 <link rel="import" href="chrome://downloads/action_service.html">
 <link rel="import" href="chrome://downloads/constants.html">
 <link rel="import" href="chrome://downloads/throttled_icon_loader.html">
@@ skipping 17 matching lines @@
           --><a is="action-link" id="file-link"
               on-click="onFileLinkClick_"></a><!-- Before #name.
           --><span id="name">[[data_.file_name]]</span>
           <span id="tag"></span>
         </div>
 
         <a id="url" target="_blank" href="[[data_.url]]">[[data_.url]]</a>
 
         <div id="description"></div>
 
-        <paper-progress id="progress"></paper-progress>
+        <template is="dom-if" if="[[showProgress_]]">
+          <paper-progress id="progress"
+              indeterminate$="[[isIndeterminate_(data_.percent)]]"
+              value$="[[data_.percent]]"></paper-progress>
+        </template>
 
         <div id="safe" class="controls" hidden$="[[isDangerous_]]">
-          <paper-button id="show" on-click="onShowClick_"
-              i18n-content="controlShowInFolder" lowercase noink></paper-button>
-          <paper-button id="retry" on-click="onRetryClick_"
-              i18n-content="controlRetry"></paper-button>
-          <paper-button id="pause" on-click="onPauseClick_"
-              i18n-content="controlPause"></paper-button>
-          <paper-button id="resume" on-click="onResumeClick_"
-              i18n-content="controlResume"></paper-button>
-          <paper-button id="cancel" on-click="onCancelClick_"
-              i18n-content="controlCancel"></paper-button>
+          <template is="dom-if" if="[[completelyOnDisk_]]">
+            <paper-button id="show" on-click="onShowClick_"
+                lowercase noink>[[i18n_.show]]</paper-button>
+          </template>
+          <template is="dom-if" if="[[data_.retry]]">
+            <paper-button id="retry"
+                on-click="onRetryClick_">[[i18n_.retry]]</paper-button>
+          </template>
+          <template is="dom-if" if="[[isInProgress_]]">
+            <paper-button id="pause"
+                on-click="onPauseClick_">[[i18n_.pause]]</paper-button>
+          </template>
+          <template is="dom-if" if="[[data_.resume]]">
+            <paper-button id="resume"
+                on-click="onResumeClick_">[[i18n_.resume]]</paper-button>
+          </template>
+          <template is="dom-if" if="[[showCancel_]]">
+            <paper-button id="cancel"
+                on-click="onCancelClick_">[[i18n_.cancel]]</paper-button>
+          </template>
           <span id="controlled-by"
               i18n-values=".innerHTML:controlByExtension"></span>
         </div>
 
         <div id="dangerous" class="controls" hidden$="[[!isDangerous_]]">
           <!-- Dangerous file types (e.g. .exe, .jar). -->
           <paper-button id="discard" i18n-content="dangerDiscard"
               on-click="onDiscardDangerous_" class="discard"
               hidden$="[[isMalware_]]"></paper-button>
           <paper-button id="save" i18n-content="dangerSave"
@@ skipping 19 matching lines @@
     </paper-material>
 
     <div id="end-cap"></div>
 
   </template>
   <link rel="import" type="css" href="chrome://resources/css/action_link.css">
   <link rel="import" type="css" href="chrome://downloads/shared_style.css">
   <link rel="import" type="css" href="chrome://downloads/item.css">
   <script src="chrome://downloads/item.js"></script>
 </dom-module>