UKM debug page

components/ukm/debug_page/debug_page.h

+// Copyright (c) 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 COMPONENTS_UKM_DEBUG_PAGE_REQUEST_JOB_H_
+#define COMPONENTS_UKM_DEBUG_PAGE_REQUEST_JOB_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "content/public/browser/url_data_source.h"
+
+namespace ukm {
+
+class UkmService;
+
+namespace debug {
+
+// Implements the chrome://ukm page for debugging UKM state.
+class DebugPage : public content::URLDataSource {
+ public:
+  typedef base::Callback<UkmService*()> ServiceGetter;
+
+  explicit DebugPage(ServiceGetter service_getter);
+
+  // content::URLDataSource:
+  std::string GetSource() const override;
+  std::string GetMimeType(const std::string& path) const override;
+  void StartDataRequest(
+      const std::string& path,
+      const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
+      const content::URLDataSource::GotDataCallback& callback) override;
+  bool AllowCaching() const override;
+
+ private:
+  ~DebugPage() override;
+
+  ServiceGetter service_getter_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(DebugPage);
+};
+
+}  // namespace debug
+}  // namespace ukm
+
+#endif  // COMPONENTS_UKM_DEBUG_PAGE_REQUEST_JOB_H_