Implement chrome.experimental.downloads.onChanged

content/browser/download/download_stats.cc

 // Copyright (c) 2011 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.
 
 #include "content/browser/download/download_stats.h"
 
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "content/browser/download/download_resource_handler.h"
 #include "content/browser/download/interrupt_reasons.h"
@@ skipping 299 matching lines @@
 }
 
 void RecordOpensOutstanding(int size) {
   UMA_HISTOGRAM_CUSTOM_COUNTS("Download.OpensOutstanding",
                               size,
                               0/*min*/,
                               (1 << 10)/*max*/,
                               64/*num_buckets*/);
 }
 
+void RecordOnChanged(int percent) {
+  UMA_HISTOGRAM_PERCENTAGE("Download.OnChanged", percent);
+}
+
 }  // namespace download_stats