Create a histogram serialization mechanism in components/metrics

components/metrics.gypi

Index: components/metrics.gypi
diff --git a/components/metrics.gypi b/components/metrics.gypi
index 6036cae0cf91e3ef123fbdb65ffb35b7a63ebd35..e32a953bda7154e8a513a050612c735f5ff21902 100644
--- a/components/metrics.gypi
+++ b/components/metrics.gypi
@@ -16,7 +16,26 @@
       '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$']]
+        } ] ]
+    }
   ],
+
 }