Show number of remaining files when copying directories.

ui/file_manager/file_manager/background/js/file_operation_util.js

Index: ui/file_manager/file_manager/background/js/file_operation_util.js
diff --git a/ui/file_manager/file_manager/background/js/file_operation_util.js b/ui/file_manager/file_manager/background/js/file_operation_util.js
index 73bb7268651baf18e607a82adb79fbd255e18461..2db0aea30b991f5a253a6c4cd26adaa301755e59 100644
--- a/ui/file_manager/file_manager/background/js/file_operation_util.js
+++ b/ui/file_manager/file_manager/background/js/file_operation_util.js
@@ -612,14 +612,34 @@ fileOperationUtil.Task.prototype.run = function(
 
 /**
  * Get states of the task.
- * TOOD(hirono): Removes this method and sets a task to progress events.
+ * TODO(hirono): Removes this method and sets a task to progress events.
  * @return {Object} Status object.
  */
 fileOperationUtil.Task.prototype.getStatus = function() {
   var processingEntry = this.sourceEntries[this.processingSourceIndex_];
+  var numRemainingItems = 0;
+
+  var resolvedEntryMap;
+  if (this.processingEntries && this.processingEntries.length > 0)
+    resolvedEntryMap = this.processingEntries[this.processingSourceIndex_];
+
+  if (resolvedEntryMap) {
+    for (var key in resolvedEntryMap) {

[fukino, 2017/06/26 05:15:15]

not lgtm, since this changes asymptotic time complexity of updating the
progress, and the overhead might slow down the copy operation.

[tetsui, 2017/06/26 06:51:20]

Done.

+      if (resolvedEntryMap.hasOwnProperty(key) &&
+          resolvedEntryMap[key].processedBytes === 0) {
+        numRemainingItems++;
+      }
+    }
+    for (var i = this.processingSourceIndex_ + 1;
+         i < this.processingEntries.length; i++) {
+      numRemainingItems += Object.keys(this.processingEntries[i] || {}).length;
+    }
+  } else {
+    numRemainingItems = this.sourceEntries.length - this.processingSourceIndex_;
+  }
   return {
     operationType: this.operationType,
-    numRemainingItems: this.sourceEntries.length - this.processingSourceIndex_,
+    numRemainingItems: numRemainingItems,
     totalBytes: this.totalBytes,
     processedBytes: this.processedBytes,
     processingEntryName: processingEntry ? processingEntry.name : ''