Refoctoring FileSelection and FileSelectionHandler.

ui/file_manager/file_manager/foreground/js/dialog_action_controller.js

Index: ui/file_manager/file_manager/foreground/js/dialog_action_controller.js
diff --git a/ui/file_manager/file_manager/foreground/js/dialog_action_controller.js b/ui/file_manager/file_manager/foreground/js/dialog_action_controller.js
index 369161c98e681909b5b7b66b4ce7d5feec582ae6..b71cb5e84037c4e88e5f89488427e1f19bd8cbb0 100644
--- a/ui/file_manager/file_manager/foreground/js/dialog_action_controller.js
+++ b/ui/file_manager/file_manager/foreground/js/dialog_action_controller.js
@@ -116,7 +116,8 @@ function DialogActionController(
   dialogFooter.filenameInput.addEventListener(
       'input', this.updateOkButton_.bind(this));
   fileSelectionHandler.addEventListener(
-      'change', this.onFileSelectionChanged_.bind(this));
+      FileSelectionHandler.EventType.CHANGE_THROTTLED,
+      this.onFileSelectionChanged_.bind(this));
 
   dialogFooter.initFileTypeFilter(
       this.fileTypes_, launchParam.includeAllFiles);
@@ -411,7 +412,13 @@ DialogActionController.prototype.onFileSelectionChanged_ = function() {
     this.dialogFooter_.filenameInput.value = selection.entries[0].name;
   }
 
-  this.updateOkButton_();
+  selection.completeInit().then(function() {
+    if (this.fileSelectionHandler_.selection !== selection)
+      return;
+    this.updateOkButton_();
+    if (!this.dialogFooter_.okButton.disable)
+      util.testSendMessage('dialog-ready');
+  }.bind(this));
 };
 
 /**
@@ -442,27 +449,19 @@ DialogActionController.prototype.updateOkButton_ = function() {
     return;
   }
 
-  var isDriveOffline =
-      this.volumeManager_.getDriveConnectionState().type ===
-      VolumeManagerCommon.DriveConnectionType.OFFLINE;
-  var filesAvailable =
-      !this.directoryModel_.isOnDrive() ||
-      !isDriveOffline ||
-      selection.allDriveFilesPresent;
-
   if (this.dialogType_ === DialogType.SELECT_OPEN_FILE) {
     this.dialogFooter_.okButton.disabled =
-        !filesAvailable ||
         selection.directoryCount !== 0 ||
-        selection.fileCount !== 1;
+        selection.fileCount !== 1 ||
+        !this.fileSelectionHandler_.isAvailable();
     return;
   }
 
   if (this.dialogType_ === DialogType.SELECT_OPEN_MULTI_FILE) {
     this.dialogFooter_.okButton.disabled =
-        !filesAvailable ||
         selection.directoryCount !== 0 ||
-        selection.fileCount === 0;
+        selection.fileCount === 0 ||
+        !this.fileSelectionHandler_.isAvailable();
     return;
   }