Export the dialog type where Quick View is opened.

ui/file_manager/file_manager/foreground/js/quick_view_uma.js

 // Copyright 2016 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.
 
 /**
  * UMA exporter for Quick View.
  *
  * @param {!VolumeManagerWrapper} volumeManager
+ * @param {!DialogType} dialogType
  *
  * @constructor
  */
-function QuickViewUma(volumeManager) {
+function QuickViewUma(volumeManager, dialogType) {
 
   /**
    * @type {!VolumeManagerWrapper}
    * @private
    */
   this.volumeManager_ = volumeManager;
+  /**
+   * @type {DialogType}
+   * @private
+   */
+  this.dialogType_ = dialogType;
 }
 
 /**
  * Keep the order of this in sync with FileManagerVolumeType in
  * tools/metrics/histograms/histograms.xml.
  *
  * @type {!Array<VolumeManagerCommon.VolumeType>}
  * @const
  */
 QuickViewUma.VolumeType = [
@@ skipping 37 matching lines @@
  */
 QuickViewUma.prototype.onOpened = function(entry) {
   this.exportFileType_(entry, 'QuickView.FileTypeOnLaunch');
   var volumeType = this.volumeManager_.getVolumeInfo(entry).volumeType;
   if (QuickViewUma.VolumeType.includes(volumeType)) {
     metrics.recordEnum(
         'QuickView.VolumeType', volumeType, QuickViewUma.VolumeType);
   } else {
     console.error('Unknown volume type: ' + volumeType);
   }
+  // Record stats of dialog types. It must be in sync with
+  // FileDialogType enum in tools/metrics/histograms/histogram.xml.
+  metrics.recordEnum('QuickView.DialogType', this.dialogType_,
+      [DialogType.SELECT_FOLDER,
+       DialogType.SELECT_UPLOAD_FOLDER,
+       DialogType.SELECT_SAVEAS_FILE,
+       DialogType.SELECT_OPEN_FILE,
+       DialogType.SELECT_OPEN_MULTI_FILE,
+       DialogType.FULL_PAGE]);
 };