Implement Ukm Mojo interface.

components/ukm/public/mojo_ukm_recorder.cc

Index: components/ukm/public/mojo_ukm_recorder.cc
diff --git a/components/ukm/public/mojo_ukm_recorder.cc b/components/ukm/public/mojo_ukm_recorder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8d5af8f9e7f9310331f35773f88da701a6b23bae
--- /dev/null
+++ b/components/ukm/public/mojo_ukm_recorder.cc
@@ -0,0 +1,24 @@
+// 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.
+
+#include "components/ukm/public/mojo_ukm_recorder.h"
+
+#include "base/memory/ptr_util.h"
+
+namespace ukm {
+
+MojoUkmRecorder::MojoUkmRecorder(mojom::UkmRecorderInterfacePtr interface)
+    : interface_(std::move(interface)) {}
+MojoUkmRecorder::~MojoUkmRecorder() = default;
+
+void MojoUkmRecorder::UpdateSourceURL(SourceId source_id, const GURL& url) {
+  DCHECK(false);
+  // Not implemented yet, currently a no-op.
+}
+
+void MojoUkmRecorder::AddEntry(mojom::UkmEntryPtr entry) {
+  interface_->AddEntry(std::move(entry));
+}
+
+}  // namespace ukm