WebView: Create UMA uploader

android_webview/native/aw_metrics_log_uploader.h

Index: android_webview/native/aw_metrics_log_uploader.h
diff --git a/android_webview/native/aw_metrics_log_uploader.h b/android_webview/native/aw_metrics_log_uploader.h
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+++ b/android_webview/native/aw_metrics_log_uploader.h
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+// 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.
+
+#ifndef ANDROID_WEBVIEW_NATIVE_AW_METRICS_LOG_UPLOADER_H_
+#define ANDROID_WEBVIEW_NATIVE_AW_METRICS_LOG_UPLOADER_H_
+
+#include <jni.h>
+#include <string>
+
+#include "components/metrics/metrics_log_uploader.h"
+
+namespace android_webview {
+
+// Uploads UMA logs for WebView using the platform logging mechanism.
+class AwMetricsLogUploader : public ::metrics::MetricsLogUploader {
+ public:
+  explicit AwMetricsLogUploader(
+      const base::Callback<void(int)>& on_upload_complete);
+
+  ~AwMetricsLogUploader() override;
+
+  // ::metrics::MetricsLogUploader:
+  void UploadLog(const std::string& compressed_log_data,
+                 const std::string& log_hash) override;
+
+ private:
+  const base::Callback<void(int)> on_upload_complete_;
+
+  DISALLOW_COPY_AND_ASSIGN(AwMetricsLogUploader);
+};
+
+}  // namespace android_webview
+
+#endif  // ANDROID_WEBVIEW_NATIVE_AW_METRICS_LOG_UPLOADER_H_