Adding a format device button to UI.

chrome/browser/resources/file_manager/js/file_manager.js

Index: chrome/browser/resources/file_manager/js/file_manager.js
diff --git a/chrome/browser/resources/file_manager/js/file_manager.js b/chrome/browser/resources/file_manager/js/file_manager.js
index f3f490c84969ee016d510aee70dce34fd0bf2908..9069d7d04edf918d7c7da65bbff3da5443f5f604 100644
--- a/chrome/browser/resources/file_manager/js/file_manager.js
+++ b/chrome/browser/resources/file_manager/js/file_manager.js
@@ -1471,10 +1471,14 @@ FileManager.prototype = {
     if (this.dialogType_ == FileManager.DialogType.FULL_PAGE) {
       // Since unmount task cannot be defined in terms of file patterns,
       // we manually include it here, if all selected items are mount points.
+      this.taskButtons_.innerHTML = '';
       chrome.fileBrowserPrivate.getFileTasks(
           selection.urls,
           this.onTasksFound_.bind(this,
                                   this.shouldShowUnmount_(selection.urls)));
+      // This needs to be done in sparate function, as check requires
+      // asynchronous function calls.
+      this.DisplayFormattingTask1_(selection.entries);
     }
 
     cacheNextFile();
@@ -1549,8 +1553,6 @@ FileManager.prototype = {
           title: ''
       });
     }
-
-    this.taskButtons_.innerHTML = '';
     for (var i = 0; i < tasksList.length; i++) {
       var task = tasksList[i];
 
@@ -1586,19 +1588,65 @@ FileManager.prototype = {
           task.title = str('UNMOUNT_ARCHIVE');
         }
       }
+      this.renderTaskButton_(task);
+    }
+  };
 
-      var button = this.document_.createElement('button');
-      button.addEventListener('click', this.onTaskButtonClicked_.bind(this));
-      button.className = 'task-button';
-      button.task = task;
+  FileManager.prototype.renderTaskButton_ = function(task) {
+    var button = this.document_.createElement('button');
+    button.addEventListener('click', this.onTaskButtonClicked_.bind(this));
+    button.className = 'task-button';
+    button.task = task;
 
-      var img = this.document_.createElement('img');
-      img.src = task.iconUrl;
+    var img = this.document_.createElement('img');
+    img.src = task.iconUrl;
 
-      button.appendChild(img);
-      button.appendChild(this.document_.createTextNode(task.title));
+    button.appendChild(img);
+    button.appendChild(this.document_.createTextNode(task.title));
 
-      this.taskButtons_.appendChild(button);
+    this.taskButtons_.appendChild(button);
+  };
+
+  /**
+   * Checks whether formatting task should be displayed and if the answer is
+   * affirmative renders it. Includes asynchronous calls, so it's splitted into
+   * three parts.
+   */
+  FileManager.prototype.DisplayFormattingTask1_ = function(entries) {
+    if (entries.length != 1)
+      return;
+    var self = this;
+    chrome.fileBrowserPrivate.getMountPoints(
+        this.DisplayFormattingTask2_.bind(this, entries[0].fullPath));
+  };
+
+  FileManager.prototype.DisplayFormattingTask2_ = function(mountPath,
+                                                           mountPoints) {
+    var normalize = function(x) {
+      if(x[0] != '/')
+        return '/' + x;
+      else
+        return x;
+    }
+    this.mountPoints_ = mountPoints;
+    for (var i = 0; i < mountPoints.length; ++i) {
+      if (mountPoints[i].mountType == "device" &&
+          normalize(mountPoints[i].mountPath) == normalize(mountPath)) {
+        chrome.fileBrowserPrivate.getVolumeMetadata(mountPoints[i].sourceUrl,
+            this.DisplayFormattingTask3_.bind(this));
+        return;
+      }
+    }
+  };
+
+  FileManager.prototype.DisplayFormattingTask3_ = function(volumeMetadata) {
+    if (volumeMetadata.deviceType == "flash") {
+      var task = {
+        taskId: this.getExtensionId_() + '|format-device',
+        iconUrl: chrome.extension.getURL('images/filetype_generic.png'),
+        title: str('FORMAT_DEVICE')
+      };
+      this.renderTaskButton_(task);
     }
   };
 
@@ -1666,6 +1714,10 @@ FileManager.prototype = {
       for (var index = 0; index < urls.length; ++index) {
         chrome.fileBrowserPrivate.removeMount(urls[index]);
       }
+    } else if (id == 'format-device') {
+      if (!confirm(str('FORMATTING_WARNING')))
+        return;
+      chrome.fileBrowserPrivate.formatDevice(urls[0]);
     }
   };