Let MetricsService know about some Android Activities

base/metrics/histogram.h

Index: base/metrics/histogram.h
diff --git a/base/metrics/histogram.h b/base/metrics/histogram.h
index 9845362d98aa31cad7557383e2fc1e039ad5f67e..e90d02161100d1ad8f514066f22c980dc41ae288 100644
--- a/base/metrics/histogram.h
+++ b/base/metrics/histogram.h
@@ -353,6 +353,12 @@ class Lock;
         base::LinearHistogram::FactoryGet(name, 1, boundary_value, \
             boundary_value + 1, base::HistogramBase::kUmaTargetedHistogramFlag))
 
+#define UMA_STABILITY_HISTOGRAM_ENUMERATION(name, sample, boundary_value) \

[Alexei Svitkine (slow), 2014/01/22 21:14:19]

Please add a comment that explains this macro (and when it should be used).

[Kibeom Kim (inactive), 2014/01/24 19:45:09]

Done.

+    STATIC_HISTOGRAM_POINTER_BLOCK(name, Add(sample), \

[Alexei Svitkine (slow), 2014/01/22 21:14:19]

I would maybe make an UMA_HISTOGRAM_ENUMERATION_WITH_FLAGS() macro that both
this and UMA_HISTOGRAM_ENUMERATION() use and specify different flags, to avoid
logic duplication between the two.

[Kibeom Kim (inactive), 2014/01/24 19:45:09]

Done.

+        base::LinearHistogram::FactoryGet(name, 1, boundary_value, \
+            boundary_value + 1, \
+            base::HistogramBase::kUmaTargetedStabilityHistogramFlag))
+
 #define UMA_HISTOGRAM_CUSTOM_ENUMERATION(name, sample, custom_ranges) \
     STATIC_HISTOGRAM_POINTER_BLOCK(name, Add(sample), \
         base::CustomHistogram::FactoryGet(name, custom_ranges, \