Log base::Features in Launch.FlagsAtStartup

chrome/browser/about_flags.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_ABOUT_FLAGS_H_
 #define CHROME_BROWSER_ABOUT_FLAGS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 70 matching lines @@
 void ResetAllFlags(flags_ui::FlagsStorage* flags_storage);
 
 // Sends UMA stats about experimental flag usage. This should be called once per
 // startup.
 void RecordUMAStatistics(flags_ui::FlagsStorage* flags_storage);
 
 // Returns the UMA id for the specified switch name.
 base::HistogramBase::Sample GetSwitchUMAId(const std::string& switch_name);
 
 // Sends stats (as UMA histogram) about a set of command line |flags| in
 // a histogram, with an enum value for each flag in |flags|, based on the

[Alexander Alekseev, 2016/09/18 10:08:01]

nit: update comment.

[lawrencewu, 2016/09/19 18:01:03]

Done.

 // hash of the flag name.
 void ReportAboutFlagsHistogram(const std::string& uma_histogram_name,
-                               const std::set<std::string>& flags);
+                               const std::set<std::string>& switches,
+                               const std::set<std::string>& features);
 
 namespace testing {
 
 // Returns the global set of feature entries.
 const flags_ui::FeatureEntry* GetFeatureEntries(size_t* count);
 
 // This value is reported as switch histogram ID if switch name has unknown
 // format.
 extern const base::HistogramBase::Sample kBadSwitchFormatHistogramId;
 
 }  // namespace testing
 
 }  // namespace about_flags
 
 #endif  // CHROME_BROWSER_ABOUT_FLAGS_H_