WebView: Create UMA uploader

components/metrics/simple_metrics_log_uploader.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/metrics/simple_metrics_log_uploader.h"
+
+#include <string>
+
+#include "third_party/zlib/google/compression_utils.h"
+
+namespace metrics {
+
+void SimpleMetricsLogUploader::UploadLog(const std::string& compressed_log_data,
+                                         const std::string& log_hash) {
+  std::string uncompressed_log_data;
+  compression::GzipUncompress(compressed_log_data, &uncompressed_log_data);
+  UploadLog(uncompressed_log_data);
+}
+
+}  // namespace metrics