Randomly select a single rappor sample when more than one is collected.

components/rappor/bloom_filter.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 "components/rappor/bloom_filter.h"
 
 #include "base/logging.h"
 #include "third_party/smhasher/src/City.h"
 
 namespace rappor {
@@ skipping 15 matching lines @@
     // functions, such as MD5, SHA1, or Murmur, would probably also work.
     uint32_t index =
         CityHash64WithSeed(str.data(), str.size(), hash_seed_offset_ + i);
     // Note that the "bytes" are uint8_t, so they are always 8-bits.
     uint32_t byte_index = (index / 8) % bytes_.size();
     uint32_t bit_index = index % 8;
     bytes_[byte_index] |= 1 << bit_index;
   }
 }
 
+void BloomFilter::Clear() {
+  for (size_t i = 0; i < bytes_.size(); ++i) {
+    bytes_[i] = 0;
+  }
+}
+
+void BloomFilter::SetBytesForTesting(const ByteVector& bytes) {
+  DCHECK_EQ(bytes.size(), bytes_.size());

[Alexei Svitkine (slow), 2014/07/30 17:12:47]

Nit: Swap params (expected size should be on the left).

[Steven Holte, 2014/08/04 23:30:26]

Done.

+  for (size_t i = 0; i < bytes_.size(); ++i) {
+    bytes_[i] = bytes[i];
+  }
+}
+
 }  // namespace rappor