Enforce min expected value for CustomCountHistograms on android

base/android/record_histogram.cc

 // Copyright 2014 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.
 
 #include "base/android/record_histogram.h"
 
 #include <stdint.h>
 
 #include <map>
 #include <string>
@@ skipping 95 matching lines @@
     int32_t min = static_cast<int32_t>(j_min);
     int32_t max = static_cast<int32_t>(j_max);
     int32_t num_buckets = static_cast<int32_t>(j_num_buckets);
     HistogramBase* histogram = HistogramFromKey(j_histogram_key);
     if (histogram) {
       CheckHistogramArgs(env, j_histogram_name, min, max, num_buckets,
                          histogram);
       return histogram;
     }
 
+    DCHECK_GE(min, 1) << "The min expected sample must be >= 1";
+
     std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);
     histogram =
         Histogram::FactoryGet(histogram_name, min, max, num_buckets,
                               HistogramBase::kUmaTargetedHistogramFlag);
     return histogram;
   }
 
   HistogramBase* LinearCountHistogram(JNIEnv* env,
                                       jstring j_histogram_name,
                                       jlong j_histogram_key,
@@ skipping 182 matching lines @@
   std::unique_ptr<HistogramSamples> samples = histogram->SnapshotSamples();
   return samples->GetCount(static_cast<int>(sample));
 }
 
 bool RegisterRecordHistogram(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace base