[Autofill] Add upstreaming UKM

components/autofill/core/browser/autofill_ukm.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/autofill/core/browser/autofill_ukm.h"
+
+#include <map>
+
+#include "components/ukm/ukm_entry_builder.h"
+#include "components/ukm/ukm_service.h"
+#include "url/gurl.h"
+
+namespace autofill {
+
+// static
+bool AutofillUkm::LogUkm(ukm::UkmService* ukm_service,
+                         const GURL& url,
+                         const std::string& ukm,
+                         const std::map<std::string, int>& metrics) {
+  if (!ukm_service) {
+    DVLOG(3) << "No UKM service.";

[Mathieu, 2017/03/09 18:40:49]

these DVLOG are not very useful?

[sebsg, 2017/03/09 19:57:04]

Done.

+    return false;
+  }
+
+  if (!url.is_valid()) {
+    DVLOG(3) << "Invalid URL.";
+    return false;
+  }
+
+  if (metrics.empty()) {
+    DVLOG(3) << "No Metrics to log.";
+    return false;
+  }
+
+  DVLOG(3) << "Sending event for url: " << url.spec();
+  int32_t source_id = ukm_service->GetNewSourceID();
+  ukm_service->UpdateSourceURL(source_id, url);
+  std::unique_ptr<ukm::UkmEntryBuilder> builder =
+      ukm_service->GetEntryBuilder(source_id, ukm.c_str());
+
+  for (auto it = metrics.begin(); it != metrics.end(); ++it) {
+    builder->AddMetric(it->first.c_str(), it->second);
+  }
+
+  return true;
+}
+
+}  // namespace autofill