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

components/rappor/bloom_filter.h

Index: components/rappor/bloom_filter.h
diff --git a/components/rappor/bloom_filter.h b/components/rappor/bloom_filter.h
index d9acfa4efce9aead751059d2b87ab544036a70f3..482f1c3668eeadff185ba9ead35aa4b90cf70e2a 100644
--- a/components/rappor/bloom_filter.h
+++ b/components/rappor/bloom_filter.h
@@ -25,12 +25,15 @@ class BloomFilter {
               uint32_t hash_seed_offset);
   ~BloomFilter();
 
-  // Add a single string to the Bloom filter.
-  void AddString(const std::string& str);
+  // Sets the Bloom filter bits to contain a single string.
+  void SetString(const std::string& str);
 
   // Returns the current value of the Bloom filter's bit array.
   const ByteVector& bytes() const { return bytes_; };
 
+  // Sets bytes for testing purposes.
+  void SetBytesForTesting(const ByteVector& bytes);
+
  private:
   // Stores the byte array of the Bloom filter.
   ByteVector bytes_;