Let MetricsService know about some Android Activities

base/metrics/histogram_base.h

Index: base/metrics/histogram_base.h
diff --git a/base/metrics/histogram_base.h b/base/metrics/histogram_base.h
index 4248bd84a4c3136f6f2a1ee60483fa54e14ce2e9..92678ff386266d226bf0035733b5baa193cbf057 100644
--- a/base/metrics/histogram_base.h
+++ b/base/metrics/histogram_base.h
@@ -57,6 +57,9 @@ class BASE_EXPORT HistogramBase {
     kNoFlags = 0,
     kUmaTargetedHistogramFlag = 0x1,  // Histogram should be UMA uploaded.
 
+    // Histogram should be UMA uploaded, but as a part of initial stability log.
+    kUmaTargetedStabilityHistogramFlag =0x2,

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

I think the flag should mention it's an Stability histogram, but should still
set kUmaTargetedHistogramFlag flag. (So stability histograms would set both that
flag and the new one.)

Also, I think these should be included in regular UMA logs as well (not just
initial stability). In some cases, the initial stability log won't be created,
so we don't want to lose these histograms for that.

Also, nit: space after =

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

Done.

+
     // Indicate that the histogram was pickled to be sent across an IPC Channel.
     // If we observe this flag on a histogram being aggregated into after IPC,
     // then we are running in a single process mode, and the aggregation should