RAPPOR implementation

components/variations/metrics_util_unittest.cc

Index: components/variations/metrics_util_unittest.cc
diff --git a/components/variations/metrics_util_unittest.cc b/components/variations/metrics_util_unittest.cc
index 4f324947176ec79b7830c9423abae991ea408476..8fec3d1639d5b7f0a4373c701a981bf0e912ccd8 100644
--- a/components/variations/metrics_util_unittest.cc
+++ b/components/variations/metrics_util_unittest.cc
@@ -4,6 +4,8 @@
 
 #include "components/variations/metrics_util.h"
 
+#include "base/format_macros.h"
+#include "base/strings/stringprintf.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace metrics {
@@ -28,4 +30,22 @@ TEST(MetricsUtilTest, HashName) {
     EXPECT_EQ(known_hashes[i].hash_value, HashName(known_hashes[i].name));
 }
 
+// Make sure our ID hashes are the same as what we see on the server side.
+TEST(MetricsUtilTest, HashMetricName) {
+  static const struct {
+    std::string input;
+    std::string output;
+  } cases[] = {
+    {"Back", "0x0557fa923dcee4d0"},
+    {"Forward", "0x67d2f6740a8eaebf"},
+    {"NewTab", "0x290eb683f96572f1"},
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(cases); ++i) {
+    uint64 hash = HashMetricName(cases[i].input);
+    std::string hash_hex = base::StringPrintf("0x%016" PRIx64, hash);
+    EXPECT_EQ(cases[i].output, hash_hex);
+  }
+}
+
 }  // namespace metrics