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..0427a0bafc7eaab5f089e3db85dfdd1c0160f636 100644
--- a/base/metrics/histogram.h
+++ b/base/metrics/histogram.h
@@ -348,10 +348,22 @@ class Lock;
 
 // The samples should always be strictly less than |boundary_value|.  For more
 // details, see the comment for the |HISTOGRAM_ENUMERATION| macro, above.
-#define UMA_HISTOGRAM_ENUMERATION(name, sample, boundary_value) \
+#define UMA_HISTOGRAM_ENUMERATION_WITH_FLAGS(name, sample, boundary_value, flags) \
     STATIC_HISTOGRAM_POINTER_BLOCK(name, Add(sample), \
         base::LinearHistogram::FactoryGet(name, 1, boundary_value, \
-            boundary_value + 1, base::HistogramBase::kUmaTargetedHistogramFlag))
+            boundary_value + 1, flags))
+
+#define UMA_HISTOGRAM_ENUMERATION(name, sample, boundary_value) \
+    UMA_HISTOGRAM_ENUMERATION_WITH_FLAGS(name, sample, boundary_value, \
+        base::HistogramBase::kUmaTargetedHistogramFlag)
+
+// In addition to UMA_HISTOGRAM_ENUMERATION, this adds |kStabilityHistogramFlag|
+// to the histogram. Use this if you are recording stability histogram, that
+// should be a part of the initial stability log.
+#define UMA_STABILITY_HISTOGRAM_ENUMERATION(name, sample, boundary_value) \
+    UMA_HISTOGRAM_ENUMERATION_WITH_FLAGS(name, sample, boundary_value, \
+        base::HistogramBase::kUmaTargetedHistogramFlag | \
+        base::HistogramBase::kStabilityHistogramFlag)
 
 #define UMA_HISTOGRAM_CUSTOM_ENUMERATION(name, sample, custom_ranges) \
     STATIC_HISTOGRAM_POINTER_BLOCK(name, Add(sample), \