[Files.app] Show dot files in the Drive volume.

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

Index: chrome/browser/resources/file_manager/foreground/js/file_manager.js
diff --git a/chrome/browser/resources/file_manager/foreground/js/file_manager.js b/chrome/browser/resources/file_manager/foreground/js/file_manager.js
index e39955e48ae4e87eeb5b68642fc5ffc9f7cbb46a..ce870d477a7c7d8e143718534e3882d0bdcf74b5 100644
--- a/chrome/browser/resources/file_manager/foreground/js/file_manager.js
+++ b/chrome/browser/resources/file_manager/foreground/js/file_manager.js
@@ -44,6 +44,13 @@ function FileManager() {
    * @private
    */
   this.currentVolumeInfo_ = null;
+
+  /**
+   * Whether to show dot files in the non-Drive folder. Default: false.
+   * @type {boolean}
+   * @private
+   */
+  this.dotFilesHidden_ = false;
 }
 
 FileManager.prototype = {
@@ -907,9 +914,7 @@ var BOTTOM_MARGIN_FOR_PREVIEW_PANEL_PX = 52;
         this.dialogType == DialogType.SELECT_UPLOAD_FOLDER ||
         this.dialogType == DialogType.SELECT_SAVEAS_FILE;
 
-    this.fileFilter_ = new FileFilter(
-        this.metadataCache_,
-        false  /* Don't show dot files by default. */);
+    this.fileFilter_ = new FileFilter(this.metadataCache_);
 
     this.fileWatcher_ = new FileWatcher(this.metadataCache_);
     this.fileWatcher_.addEventListener(
@@ -1313,6 +1318,32 @@ var BOTTOM_MARGIN_FOR_PREVIEW_PANEL_PX = 52;
   };
 
   /**
+   * Filters dot files if the setting is enabled and the current directory is
+   * '/Downloads'.
+   *
+   * @return {boolean} True if the filter is enabled, false otherwise.
+   * @private
+   */
+  FileManager.prototype.updateDotFilesFilter_ = function() {
+    var enabled =
+        this.dotFilesHidden_ &&
+        this.currentVolumeInfo_ &&
+        this.currentVolumeInfo_.volumeType !== util.VolumeType.DRIVE;
+
+    if (enabled) {
+      this.fileFilter_.addFilter(
+          'dot-file-hidden',
+          function(entry) {
+            return (entry.name.charAt(0) !== '.');
+          });
+    } else {
+      this.fileFilter_.removeFilter('dot-file-hidden');
+    }
+
+    return enabled;
+  };
+
+  /**
    * Resize details and thumb views to fit the new window size.
    * @private
    */
@@ -2308,6 +2339,8 @@ var BOTTOM_MARGIN_FOR_PREVIEW_PANEL_PX = 52;
         '' /* selectionPath */,
         '' /* opt_param */);
 
+    this.updateDotFilesFilter_();
+
     if (this.commandHandler)
       this.commandHandler.updateAvailability();
 
@@ -2841,9 +2874,8 @@ var BOTTOM_MARGIN_FOR_PREVIEW_PANEL_PX = 52;
 
     switch (util.getKeyModifiers(event) + event.keyCode) {
       case 'Ctrl-190':  // Ctrl-. => Toggle filter files.
-        this.fileFilter_.setFilterHidden(
-            !this.fileFilter_.isFilterHiddenOn());
-        event.preventDefault();
+        this.dotFilesHidden_ = !this.dotFilesHidden_;
+        this.updateDotFilesFilter_();
         return;
 
       case '27':  // Escape => Cancel dialog.
@@ -3310,7 +3342,7 @@ var BOTTOM_MARGIN_FOR_PREVIEW_PANEL_PX = 52;
       msg = str('ERROR_WHITESPACE_NAME');
     } else if (/^(CON|PRN|AUX|NUL|COM[1-9]|LPT[1-9])$/i.test(name)) {
       msg = str('ERROR_RESERVED_NAME');
-    } else if (this.fileFilter_.isFilterHiddenOn() && name[0] == '.') {
+    } else if (this.updateDotFilesFilter_() && name[0] == '.') {
       msg = str('ERROR_HIDDEN_NAME');
     }