Refactor UKM interface for mojo-ification

components/ukm/public/interfaces/ukm_interface.mojom

Index: components/ukm/public/interfaces/ukm_interface.mojom
diff --git a/components/ukm/public/interfaces/ukm_interface.mojom b/components/ukm/public/interfaces/ukm_interface.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..0625916b88a8fc6e45789b11166da00e06210db4
--- /dev/null
+++ b/components/ukm/public/interfaces/ukm_interface.mojom
@@ -0,0 +1,22 @@
+// Copyright 2017 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.
+
+module ukm.mojom;
+
+import "url/mojo/url.mojom";
+
+struct UkmMetric {
+  uint64 metric_hash;
+  int64 value;
+};
+
+struct UkmEntry {
+  int64 source_id;
+  uint64 event_hash;
+  array<UkmMetric> metrics;
+};
+
+interface UkmRecorderInterface {
+  AddEntry(UkmEntry entry);
+};