SourceEventType added to LatencyInfo

ui/events/latency_info.h

 // Copyright 2013 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 UI_EVENTS_LATENCY_INFO_H_
 #define UI_EVENTS_LATENCY_INFO_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 100 matching lines @@
   // This component indicates that the input causes a commit to be scheduled
   // but the commit was aborted since it carried no new information.
   INPUT_EVENT_LATENCY_TERMINATED_COMMIT_NO_UPDATE_COMPONENT,
   // This component indicates that the input causes a swap to be scheduled
   // but the swap failed.
   INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
   LATENCY_COMPONENT_TYPE_LAST =
       INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
 };
 
+enum SourceEventType {
+  UNKNOWN,
+  WHEEL,
+  TOUCH,
+  OTHER,
+  SOURCE_EVENT_TYPE_LAST = OTHER,
+};
+
 class EVENTS_BASE_EXPORT LatencyInfo {
  public:
   struct LatencyComponent {
     // Nondecreasing number that can be used to determine what events happened
     // in the component at the time this struct was sent on to the next
     // component.
     int64_t sequence_number;
     // Average time of events that happened in this component.
     base::TimeTicks event_time;
     // Count of events that happened in this component
     uint32_t event_count;
   };
 
   // Empirically determined constant based on a typical scroll sequence.
   enum { kTypicalMaxComponentsPerLatencyInfo = 10 };
 
   enum : size_t { kMaxInputCoordinates = 2 };
 
   // Map a Latency Component (with a component-specific int64_t id) to a
   // component info.
   typedef base::SmallMap<
       std::map<std::pair<LatencyComponentType, int64_t>, LatencyComponent>,
       kTypicalMaxComponentsPerLatencyInfo> LatencyMap;
 
   LatencyInfo();
   LatencyInfo(const LatencyInfo& other);
+  LatencyInfo(SourceEventType type);
   ~LatencyInfo();
 
   // For test only.
   LatencyInfo(int64_t trace_id, bool terminated);
 
   // Returns true if the vector |latency_info| is valid. Returns false
   // if it is not valid and log the |referring_msg|.
   // This function is mainly used to check the latency_info vector that
   // is passed between processes using IPC message has reasonable size
   // so that we are confident the IPC message is not corrupted/compromised.
@@ skipping 41 matching lines @@
 
   // Returns true if there is still room for keeping the |input_coordinate|,
   // false otherwise.
   bool AddInputCoordinate(const gfx::PointF& input_coordinate);
 
   uint32_t input_coordinates_size() const { return input_coordinates_size_; }
   const gfx::PointF* input_coordinates() const { return input_coordinates_; }
 
   const LatencyMap& latency_components() const { return latency_components_; }
 
+  const SourceEventType& source_event_type() const {
+    return source_event_type_;
+  }
+  void set_source_event_type(SourceEventType type) {
+    source_event_type_ = type;
+  }
+
   bool terminated() const { return terminated_; }
   void set_coalesced() { coalesced_ = true; }
   bool coalesced() const { return coalesced_; }
   int64_t trace_id() const { return trace_id_; }
 
  private:
   void AddLatencyNumberWithTimestampImpl(LatencyComponentType component,
                                          int64_t id,
                                          int64_t component_sequence_number,
                                          base::TimeTicks time,
@@ skipping 15 matching lines @@
   // These coordinates represent window coordinates of the original input event.
   uint32_t input_coordinates_size_;
   gfx::PointF input_coordinates_[kMaxInputCoordinates];
 
   // The unique id for matching the ASYNC_BEGIN/END trace event.
   int64_t trace_id_;
   // Whether this event has been coalesced into another event.
   bool coalesced_;
   // Whether a terminal component has been added.
   bool terminated_;
+  // Stores the type of the first source event.
+  SourceEventType source_event_type_;
 
 #if !defined(OS_IOS)
   friend struct IPC::ParamTraits<ui::LatencyInfo>;
   friend struct mojo::StructTraits<ui::mojom::LatencyInfoDataView,
                                    ui::LatencyInfo>;
 #endif
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_LATENCY_INFO_H_