Show the eject button only for removabled and file handlers.

chrome/common/extensions/api/file_manager_private.idl

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // fileManagerPrivate API.
 // This is a private API used by the file browser of ChromeOS.
 [platforms=("chromeos"),
  implemented_in="chrome/browser/chromeos/extensions/file_manager/file_manager_private_api_functions.h"]
 namespace fileManagerPrivate {
 // Type of the mounted volume.
@@ skipping 156 matching lines @@
   shared,
   externalFileUrl
 };
 
 // Entry property visibility for setEntryTag();
 enum EntryTagVisibility {
   private,
   public
 };
 
+// Source of the volume data.
+enum Source {
+  file,
+  device,
+  network,
+  system
+};
+
 // A file task represents an action that the file manager can perform over the
 // currently selected files. See
 // chrome/browser/chromeos/extensions/file_manager/file_tasks.h for details
 // about how file tasks are handled.
 dictionary FileTask {
   // The unique identifier of the task.
   DOMString taskId;
 
   // Task title (ex. App name).
   DOMString title;
@@ skipping 96 matching lines @@
 dictionary VolumeMetadata {
   // ID of the disk volume.
   DOMString volumeId;
 
   // Id the provided file system (for provided file systems).
   DOMString? fileSystemId;
 
   // Extension providing this volume (for provided file systems).
   DOMString? extensionId;
 
+  // Source of the volume's data.
+  Source source;
+
   // Label of the volume (if available).
   DOMString? volumeLabel;
 
   // Description of the profile where the volume belongs.
   // TODO(hirono): Remove the property because of the design change of
   // multi-profile support.
   ProfileInfo profile;
 
   // The path to the mounted device, archive file or network resource.
   DOMString? sourcePath;
@@ skipping 10 matching lines @@
 
   // Whether the device is parent or not (i.e. sdb rather than sdb1).
   boolean? isParentDevice;
 
   // Flag that specifies if volume is mounted in read-only mode.
   boolean isReadOnly;
 
   // Flag that specifies whether the volume contains media.
   boolean hasMedia;
 
+  // Flag that specifies whether the volume is configurable.
+  boolean configurable;
+
   // Additional data about mount, for example, that the filesystem is not
   // supported.
   MountCondition? mountCondition;
 
   // Context in which the volume has been mounted.
   MountContext? mountContext;
 };
 
 // Payload data for mount event.
 dictionary MountCompletedEvent {
@@ skipping 178 matching lines @@
   DOMString extensionId;
 
   // Name of the providing extension.
   DOMString name;
 
   // Whether supports configuration dialog.
   boolean configurable;
 
   // Whether supports mounting multiple instances.
   boolean multipleMounts;
-
+ 

[hirono, 2015/05/15 08:27:45]

nit: Please remove the space if the line contains it.

[mtomasz, 2015/05/15 09:32:37]

Done.

   // Source of file systems' data.
   manifestTypes.FileSystemProviderSource source;
 };
 
 // Callback that does not take arguments.
 callback SimpleCallback = void();
 
 // |result| Boolean result returned by the invoked function.
 callback BooleanCallback = void(boolean result);
 
@@ skipping 390 matching lines @@
 
   static void onPreferencesChanged();
 
   static void onDriveConnectionStatusChanged();
 
   static void onDeviceChanged(DeviceEvent event);
 
   static void onDriveSyncError(DriveSyncErrorEvent event);
 };
 };