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 39 matching lines @@
  public:
   typedef int Sample;                   // Used for samples.
   typedef subtle::Atomic32 Count;     // Used to count samples.
 
   static const Sample kSampleType_MAX;  // INT_MAX
 
   enum Flags {
     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
     // 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,
   };
@@ skipping 90 matching lines @@
  private:
   const std::string histogram_name_;
   int32 flags_;
 
   DISALLOW_COPY_AND_ASSIGN(HistogramBase);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_HISTOGRAM_BASE_H_