Create a histogram serialization mechanism in components/metrics

components/metrics.gypi

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       'target_name': 'metrics',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
       ],
       'sources': [
         'metrics/metrics_hashes.cc',
         'metrics/metrics_hashes.h',
+          'metrics/metrics_utils_chromeos.cc',

[Ben Chan, 2014/04/18 20:27:08]

nit: fix indentation

+          'metrics/metrics_utils_chromeos.h',

[Ben Chan, 2014/04/18 20:27:08]

I noticed some other parts of chrome uses a chromeos subdirectory to group many
chromeos-specific files together instead of using the _chromeos sufffix on
individual files. If these classes only exist on chromeos, wouldn't it be better
to use the subdirectory approach, especially when there are many of them.

That said, it's better check with OWNERS on the preferred ways.

+          'metrics/metric_sample_chromeos.cc',
+          'metrics/metric_sample_chromeos.h',
+          'metrics/crash_sample_chromeos.cc',
+          'metrics/crash_sample_chromeos.h',
+          'metrics/histogram_sample_chromeos.cc',
+          'metrics/histogram_sample_chromeos.h',
+          'metrics/linearhistogram_sample_chromeos.cc',
+          'metrics/linearhistogram_sample_chromeos.h',
+          'metrics/sparsehistogram_sample_chromeos.cc',
+          'metrics/sparsehistogram_sample_chromeos.h',
+          'metrics/useraction_sample_chromeos.cc',
+          'metrics/useraction_sample_chromeos.cc',
       ],
-    },
+      'conditions': [
+        ['chromeos==1', {
+          'sources/': [ ['include', '_chromeos\\.cc$']]
+        } ] ]
+    }
   ],
+
 }