Adding metrics logging for Simplified Gesture Navigation.

content/browser/web_contents/aura/types.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 "content/browser/web_contents/aura/types.h"
+
+namespace content {
+
+UmaNavigationType GetUmaNavigationType(NavigationDirection direction,
+                                       OverscrollSource source) {
+  if (direction == NavigationDirection::NONE ||
+      source == OverscrollSource::NONE) {
+    return NAVIGATION_TYPE_NONE;
+  }
+  if (direction == NavigationDirection::BACK) {
+    return source == OverscrollSource::TOUCHPAD
+               ? UmaNavigationType::BACK_TOUCHPAD
+               : UmaNavigationType::BACK_TOUCHSCREEN;
+  }
+  DCHECK_EQ(direction, NavigationDirection::FORWARD);
+  return source == OverscrollSource::TOUCHPAD
+             ? UmaNavigationType::FORWARD_TOUCHPAD
+             : UmaNavigationType::FORWARD_TOUCHSCREEN;
+}
+
+}  // namespace content