Move HashMetricName to base namespace.

base/metrics/BUILD.gn

Index: base/metrics/BUILD.gn
diff --git a/base/metrics/BUILD.gn b/base/metrics/BUILD.gn
index 94bfb6c34da7a3b57e38eb1dd4121c329e7ef2cf..b3ede465eaf0fc987277887415a148f9bca02f65 100644
--- a/base/metrics/BUILD.gn
+++ b/base/metrics/BUILD.gn
@@ -20,6 +20,8 @@ source_set("metrics") {
     "histogram_samples.h",
     "histogram_snapshot_manager.cc",
     "histogram_snapshot_manager.h",
+    "metrics_hashes.cc",
+    "metrics_hashes.h",
     "sample_map.cc",
     "sample_map.h",
     "sample_vector.cc",
@@ -45,3 +47,18 @@ source_set("metrics") {
 
   visibility = [ "//base/*" ]
 }
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "metrics_hashes_unittest.cc",

[Alexei Svitkine (slow), 2015/11/25 21:05:40]

The other unit tests in this folder are listed here:

https://code.google.com/p/chromium/codesearch#chromium/src/base/BUILD.gn&l=1372

Probably makes sense to keep them consistent and put it there too.

[bcwhite, 2015/11/25 22:58:26]

Ahh, there they are.  Will do.

+  ]
+
+  deps = [
+    ":metrics",
+    "//base:prefs_test_support",
+    "//base/test:test_support",
+    "//components/variations",
+    "//testing/gtest",
+  ]
+}