Refactor UKM interface for mojo-ification

components/ukm/public/ukm_entry_builder.cc

+// 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/ukm_entry_builder.h"
+
+#include <memory>
+
+#include "base/metrics/metrics_hashes.h"
+#include "components/ukm/public/interfaces/ukm_interface.mojom.h"
+
+namespace ukm {
+
+UkmEntryBuilder::UkmEntryBuilder(
+    const UkmEntryBuilder::AddEntryCallback& callback,
+    ukm::SourceId source_id,
+    const char* event_name)
+    : add_entry_callback_(callback), entry_(mojom::UkmEntry::New()) {
+  entry_->source_id = source_id;
+  entry_->event_hash = base::HashMetricName(event_name);
+}
+
+UkmEntryBuilder::~UkmEntryBuilder() {
+  add_entry_callback_.Run(std::move(entry_));
+}
+
+void UkmEntryBuilder::AddMetric(const char* metric_name, int64_t value) {
+  entry_->metrics.emplace_back(
+      mojom::UkmMetric::New(base::HashMetricName(metric_name), value));
+}
+
+}  // namespace ukm