Put BrowserMetrics with embedded profiles into subdir for auto-upload.

components/metrics/file_metrics_provider.h

 // Copyright 2016 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 COMPONENTS_METRICS_FILE_METRICS_PROVIDER_H_
 #define COMPONENTS_METRICS_FILE_METRICS_PROVIDER_H_
 
 #include <list>
 #include <memory>
 #include <string>
@@ skipping 39 matching lines @@
 
     // A directory of atomic PMA files. This handles a directory in which
     // files of metrics are atomically added. Only files ending with ".pma"
     // will be read. They are read according to their last-modified time and
     // never read more that once (unless they change). Only one file will
     // be read per reporting cycle. Filenames that start with a dot (.) or
     // an underscore (_) are ignored so temporary files (perhaps created by
     // the ImportantFileWriter) will not get read. Files that have been
     // read will be attempted to be deleted; should those files not be
     // deletable by this process, it is the reponsibility of the producer
-    // to keep the directory pruned in some manner.
+    // to keep the directory pruned in some manner. Added files must have a
+    // timestamp later (not the same or earlier) than the newest file that
+    // already exists or it may be assumed to have been already uploaded.
     SOURCE_HISTOGRAMS_ATOMIC_DIR,
 
     // "Active" files may be open by one or more other processes and updated
     // at any time with new samples or new histograms. Such files may also be
     // inactive for any period of time only to be opened again and have new
     // data written to them. The file should probably never be deleted because
     // there would be no guarantee that the data has been reported.
     // TODO(bcwhite): Enable when read/write mem-mapped files are supported.
     SOURCE_HISTOGRAMS_ACTIVE_FILE,
   };
@@ skipping 154 matching lines @@
 
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<FileMetricsProvider> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FileMetricsProvider);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_FILE_METRICS_PROVIDER_H_