MD settings: Storage: Add DELETE button for deleting Drive offline files.

chrome/browser/resources/settings/device_page/storage.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="drive_cache_dialog.html">
 <link rel="import" href="../prefs/prefs.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_shared_css.html">
 
@@ skipping 107 matching lines @@
       }
 
       :host-context([dir=rtl]) .end-aligned .wrapper {
         direction: ltr;
       }
 
       .end-aligned .wrapper span {
         direction: initial;
         unicode-bidi: embed;
       }
+
+      #deleteButton {
+        display: none;
+      }
+
+      [actionable] #deleteButton {
+        display: block;
+      }
+
+      button > iron-icon {
+        --iron-icon-fill-color: var(--paper-grey-400);
+        --iron-icon-height: 24px;
+        --iron-icon-width: 24px;
+      }
     </style>
     <template is="dom-if" if="[[isSpaceLow_(sizeStat_.spaceState)]]">
       <div class="settings-box first">
         <div class="message-area">
           <iron-icon icon="cr:warning"></iron-icon>
           <div class="message">
             <div class="message-title">$i18n{storageSpaceLowMessageTitle}</div>
             <div class="message-description">
               <span>$i18n{storageSpaceLowMessageLine1}</span>
               <span>$i18n{storageSpaceLowMessageLine2}</span>
@@ skipping 33 matching lines @@
           <div id="availableLabelArea" class="bar-label end-aligned">
             <div class="vertical-line"></div>
             <div class="wrapper"><span>$i18n{storageItemAvailable}</span></div>
             <div class="wrapper">
               <span class="storage-size">[[sizeStat_.availableSize]]</span>
             </div>
           </div>
         </div>
       </div>
     </div>
-    <div class="settings-box" on-tap="onDownloadsTap_" actionable>
-      <div class="start">$i18n{storageItemDownloads}</div>
-      <div id="downloadsSize" class="storage-size">
-        $i18n{storageSizeComputing}
+    <div class="settings-box two-line" on-tap="onDownloadsTap_" actionable>
+      <div class="start">
+        $i18n{storageItemDownloads}
+        <div id="downloadsSize" class="secondary">
+          $i18n{storageSizeComputing}
+        </div>
       </div>
       <button class="icon-external" is="paper-icon-button-light"
           aria-label="$i18n{storageItemDownloads}"
           aria-describedby="downloadsSize"></button>
     </div>
     <template is="dom-if" if="[[driveEnabled_]]">
-      <div class="settings-box" on-tap="onDriveCacheTap_" actionable>
-        <div class="start">$i18n{storageItemDriveCache}</div>
-        <div id="driveCacheSize" class="storage-size">
+      <div class="settings-box two-line" on-tap="onDriveCacheTap_"
+          actionable$="[[hasDriveCache_]]" >
+        <div class="start">
+          $i18n{storageItemDriveCache}
+          <div id="driveCacheSize" class="secondary">
+            $i18n{storageSizeComputing}
+          </div>
+        </div>
+        <button id="deleteButton" is="paper-icon-button-light"
+            aria-label="$i18n{storageItemDriveCache}"
+            aria-describedby="driveSizeCache">
+          <iron-icon icon="cr:delete"></iron-icon>
+        </button>
+      </div>
+    </template>
+    <div class="settings-box two-line" on-tap="onBrowsingDataTap_" actionable>
+      <div class="start">
+        $i18n{storageItemBrowsingData}
+        <div id="browsingDataSize" class="secondary">
           $i18n{storageSizeComputing}
         </div>
-        <button class="subpage-arrow" is="paper-icon-button-light"
-            aria-label="$i18n{storageItemDriveCache}"
-            aria-describedby="driveSizeCache"></button>
-      </div>
-    </template>
-    <div class="settings-box" on-tap="onBrowsingDataTap_" actionable>
-      <div class="start">$i18n{storageItemBrowsingData}</div>
-      <div id="browsingDataSize" class="storage-size">
-        $i18n{storageSizeComputing}
       </div>
       <button class="subpage-arrow" is="paper-icon-button-light"
           aria-label="$i18n{storageItemBrowsingData}"
           aria-describedby="browsingDataSize"></button>
     </div>
     <template is="dom-if" if="[[androidEnabled_]]">
-      <div class="settings-box" on-tap="onAndroidTap_" actionable>
-        <div class="start">$i18n{storageItemAndroid}</div>
-        <div id="androidSize" class="storage-size">
-          $i18n{storageSizeComputing}
+      <div class="settings-box two-line" on-tap="onAndroidTap_" actionable>
+        <div class="start">
+          $i18n{storageItemAndroid}
+          <div id="androidSize" class="secondary">
+            $i18n{storageSizeComputing}
+          </div>
         </div>
         <button class="icon-external" is="paper-icon-button-light"
             aria-label="$i18n{storageItemAndroid}"
             aria-describedby="androidSize"></button>
       </div>
     </template>
     <template is="dom-if" if="[[!isGuest_]]">
-      <div class="settings-box" on-tap="onOtherUsersTap_" actionable>
-        <div class="start">$i18n{storageItemOtherUsers}</div>
-        <div id="otherUsersSize" class="storage-size">
-          $i18n{storageSizeComputing}
+      <div class="settings-box two-line" on-tap="onOtherUsersTap_" actionable>
+        <div class="start">
+          $i18n{storageItemOtherUsers}
+          <div id="otherUsersSize" class="secondary">
+            $i18n{storageSizeComputing}
+          </div>
         </div>
         <button class="subpage-arrow" is="paper-icon-button-light"
             aria-label="$i18n{storageItemOtherUsers}"
             aria-describedby="otherUsersSize"></button>
       </div>
     </template>
 
     <settings-drive-cache-dialog id="storageDriveCache">
     </settings-drive-cache-dialog>
   </template>
   <script src="storage.js"></script>
 </dom-module>