1 files changed, 52 insertions, 0 deletions
diff --git a/chromium/components/ntp_snippets/contextual/contextual_suggestions_composite_reporter.h b/chromium/components/ntp_snippets/contextual/contextual_suggestions_composite_reporter.h
new file mode 100644
index 00000000000..a75c8fbda56
--- /dev/null
+++ b/chromium/components/ntp_snippets/contextual/contextual_suggestions_composite_reporter.h
@@ -0,0 +1,52 @@
+// Copyright 2018 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_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_SUGGESTIONS_COMPOSITE_REPORTER_H_
+#define COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_SUGGESTIONS_COMPOSITE_REPORTER_H_
+
+#include <memory>
+#include <set>
+
+#include "base/macros.h"
+#include "components/ntp_snippets/contextual/contextual_suggestions_reporter.h"
+#include "services/metrics/public/cpp/ukm_source_id.h"
+
+namespace contextual_suggestions {
+
+// Reporter specialized for reporting to many different reporters.
+// This is an add-only collection of reporters because right now reporters live
+// as long as the service, or a proxy owning the composite. Therefore everything
+// is torn down together.
+class ContextualSuggestionsCompositeReporter
+    : public ContextualSuggestionsReporter {
+ public:
+  ContextualSuggestionsCompositeReporter();
+  ~ContextualSuggestionsCompositeReporter() override;
+
+  // ContextualSuggestionsReporter
+  void SetupForPage(const std::string& url, ukm::SourceId source_id) override;
+  void RecordEvent(ContextualSuggestionsEvent event) override;
+  void Flush() override;
+
+  // Composite pattern.
+  // Add a reporter which will be cleaned up with this. Use this if you want the
+  // reporter to be destroyed with the composite reporter.
+  void AddOwnedReporter(
+      std::unique_ptr<ContextualSuggestionsReporter> reporter);
+  // Add an unmanaged reporter. Use this if you want to manage the lifetime of
+  // this reporter yourself.
+  void AddRawReporter(ContextualSuggestionsReporter* reporter);
+
+ private:
+  // List of owned reporters.
+  std::set<std::unique_ptr<ContextualSuggestionsReporter>> owned_reporters_;
+
+  // List of all reporters that get the events.
+  std::set<ContextualSuggestionsReporter*> raw_reporters_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContextualSuggestionsCompositeReporter);
+};
+}  // namespace contextual_suggestions
+
+#endif  // COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_SUGGESTIONS_COMPOSITE_REPORTER_H_