Let MetricsService know about some Android Activities

base/metrics/histogram_base.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_METRICS_HISTOGRAM_BASE_H_
 #define BASE_METRICS_HISTOGRAM_BASE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 38 matching lines @@
 class BASE_EXPORT HistogramBase {
  public:
   typedef int Sample;                   // Used for samples.
   typedef subtle::Atomic32 AtomicCount; // Used to count samples.
   typedef int32 Count;  // Used to manipulate counts in temporaries.
 
   static const Sample kSampleType_MAX;  // INT_MAX
 
   enum Flags {
     kNoFlags = 0,
-    kUmaTargetedHistogramFlag = 0x1,  // Histogram should be UMA uploaded.
 
-    // 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
-    // not take place (as we would be aggregating back into the source
-    // histogram!).
+    // Histogram should be UMA uploaded.
+    kUmaTargetedHistogramFlag = 0x1,
+
+    // Indicates that this is a stability histogram. This flag exists to specify
+    // which histograms should be included in the initial stability log. Please
+    // refer to |MetricsService::PrepareInitialStabilityLog|.
+    kUmaStabilityHistogramFlag = kUmaTargetedHistogramFlag | 0x2,
+
+    // Indicates 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 not take place (as we would be aggregating back into
+    // the source histogram!).
     kIPCSerializationSourceFlag = 0x10,
 
     // Only for Histogram and its sub classes: fancy bucket-naming support.
     kHexRangePrintingFlag = 0x8000,
   };
 
   // Histogram data inconsistency types.
   enum Inconsistency {
     NO_INCONSISTENCIES = 0x0,
     RANGE_CHECKSUM_ERROR = 0x1,
@@ skipping 85 matching lines @@
  private:
   const std::string histogram_name_;
   int32 flags_;
 
   DISALLOW_COPY_AND_ASSIGN(HistogramBase);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_HISTOGRAM_BASE_H_