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diff --git a/test/core/util/histogram.h b/test/core/util/histogram.h
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+++ b/test/core/util/histogram.h
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+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_SUPPORT_HISTOGRAM_H
+#define GRPC_SUPPORT_HISTOGRAM_H
+
+#include <grpc/support/port_platform.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct grpc_histogram grpc_histogram;
+
+grpc_histogram* grpc_histogram_create(double resolution,
+                                      double max_bucket_start);
+void grpc_histogram_destroy(grpc_histogram* h);
+void grpc_histogram_add(grpc_histogram* h, double x);
+
+/** The following merges the second histogram into the first. It only works
+   if they have the same buckets and resolution. Returns 0 on failure, 1
+   on success */
+int grpc_histogram_merge(grpc_histogram* dst, const grpc_histogram* src);
+
+double grpc_histogram_percentile(grpc_histogram* histogram, double percentile);
+double grpc_histogram_mean(grpc_histogram* histogram);
+double grpc_histogram_stddev(grpc_histogram* histogram);
+double grpc_histogram_variance(grpc_histogram* histogram);
+double grpc_histogram_maximum(grpc_histogram* histogram);
+double grpc_histogram_minimum(grpc_histogram* histogram);
+double grpc_histogram_count(grpc_histogram* histogram);
+double grpc_histogram_sum(grpc_histogram* histogram);
+double grpc_histogram_sum_of_squares(grpc_histogram* histogram);
+
+const uint32_t* grpc_histogram_get_contents(grpc_histogram* histogram,
+                                            size_t* count);
+void grpc_histogram_merge_contents(grpc_histogram* histogram,
+                                   const uint32_t* data, size_t data_count,
+                                   double min_seen, double max_seen, double sum,
+                                   double sum_of_squares, double count);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GRPC_SUPPORT_HISTOGRAM_H */