Metrics logging for user engagement of the Reload and Feedback buttons

components/ui_metrics/sadtab_metrics_types.h

Index: components/ui_metrics/sadtab_metrics_types.h
diff --git a/components/ui_metrics/sadtab_metrics_types.h b/components/ui_metrics/sadtab_metrics_types.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 COMPONENTS_UI_METRICS_SADTAB_METRICS_TYPES_H_
+#define COMPONENTS_UI_METRICS_SADTAB_METRICS_TYPES_H_
+
+namespace ui_metrics {
+// An enum for reporting interaction events to a UMA histogram.
+// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser.tab
+enum class SadTabEvent {
+  // Records that the Sad Tab was displayed.
+  DISPLAYED = 0,
+  // Records that the main Sad Tab button was triggered.
+  BUTTON_CLICKED = 1,
+  // Records that the Sad Tab help link was triggered.
+  HELP_LINK_CLICKED = 2,
+  // Enum end marker.
+  MAX_SAD_TAB_EVENT = 3,
+};
+
+// Describes the mode of the Sad Tab as being in 'reload' mode.
+const char kSadTabReloadHistogramKey[] = "Tabs.SadTab.Reload.Event";
+// Describes the mode of the Sad Tab as being in 'feedback' mode.
+const char kSadTabFeedbackHistogramKey[] = "Tabs.SadTab.Feedback.Event";
+}
+
+#endif  // COMPONENTS_UI_METRICS_SADTAB_METRICS_TYPES_H_