WIP: Plumbing input event latency reporting through Mus GPU.

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 95 matching lines @@
 };
 
 enum SourceEventType {
   UNKNOWN,
   WHEEL,
   TOUCH,
   OTHER,
   SOURCE_EVENT_TYPE_LAST = OTHER,
 };
 
+const char* EVENTS_BASE_EXPORT GetComponentName(ui::LatencyComponentType type);
+
 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
@@ skipping 61 matching lines @@
                                      base::TimeTicks time,
                                      uint32_t event_count);
 
   // Returns true if the a component with |type| and |id| is found in
   // the latency_components and the component is stored to |output| if
   // |output| is not NULL. Returns false if no such component is found.
   bool FindLatency(LatencyComponentType type,
                    int64_t id,
                    LatencyComponent* output) const;
 
+  // Returns true if a component with |type| is found in the latency component.
+  // The first such component (when iterating over latency_components_) is
+  // stored to |output| if |output| is not NULL. Returns false if no such
+  // component is found.
+  bool FindLatency(LatencyComponentType type,
+                  LatencyComponent*output) const;
+
   void RemoveLatency(LatencyComponentType type);
 
   // 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_; }
@@ skipping 46 matching lines @@
 #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_