Move FileCopyManager to background page.

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

Index: chrome/browser/resources/file_manager/js/file_manager.js
===================================================================
--- chrome/browser/resources/file_manager/js/file_manager.js	(revision 146973)
+++ chrome/browser/resources/file_manager/js/file_manager.js	(working copy)
@@ -539,7 +539,8 @@
   };
 
   FileManager.prototype.initDataTransferOperations_ = function() {
-    this.copyManager_ = new FileCopyManager(this.filesystem_.root);
+    this.copyManager_ = FileCopyManagerWrapper.getInstance(
+        this.filesystem_.root);
     this.copyManager_.addEventListener('copy-progress',
                                        this.onCopyProgress_.bind(this));
     this.copyManager_.addEventListener('copy-operation-complete',
@@ -4643,3 +4644,60 @@
         }.bind(this));
   }
 })();
+
+var fileCopyManagerWrapper = null;
+
+/**
+ * @constructor
+ * @param {DirectoryEntry} root Root directory entry.
+ */
+function FileCopyManagerWrapper(root) {
+  var copyManagerPrototype =
+      chrome.extension.getBackgroundPage().FileCopyManager.prototype;
+
+  for (var property in copyManagerPrototype) {
+    if (this[property] === undefined &&
+        typeof copyManagerPrototype[property] === 'function') {
+      this[property] = (function(p) {
+        return function() {
+          var cmInstance =
+              chrome.extension.getBackgroundPage().FileCopyManager.getInstance(
+                  root);
+          return cmInstance[p].apply(cmInstance, arguments);
+        }
+      })(property);
+    }
+  }
+}
+
+/**
+ * Extending cr.EventTarget

[dgozman, 2012/07/17 16:10:53]

full stop

[Oleg Eterevsky, 2012/07/17 16:44:13]

Done.

+ */
+FileCopyManagerWrapper.prototype.__proto__ = cr.EventTarget.prototype;
+
+/**
+ * Create a new instance or get existing instance of FCMW.
+ * @param {DirectoryEntry} root Root directory entry.
+ * @return {FileCopyManagerWrapper}  A FileCopyManagerWrapper instance.
+ */
+FileCopyManagerWrapper.getInstance = function(root) {
+  if (fileCopyManagerWrapper === null) {
+    fileCopyManagerWrapper = new FileCopyManagerWrapper(root);
+  }
+  return fileCopyManagerWrapper;
+};
+
+/**
+ * Called be FileCopyManager to raise an event in this instance of FileManager.
+ * @param {string} eventName Event name.
+ * @param {Object} eventArgs Arbitratry field written to event object.
+ */
+FileCopyManagerWrapper.prototype.onEvent = function(eventName, eventArgs) {
+  var event = new cr.Event(eventName);
+  for (var arg in eventArgs)
+    if (eventArgs.hasOwnProperty(arg))
+      event[arg] = eventArgs[arg];
+
+  this.dispatchEvent(event);
+};
+