WIP: Plumbing input event latency reporting through Mus GPU.

ui/latency/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_LATENCY_LATENCY_INFO_H_
 #define UI_LATENCY_LATENCY_INFO_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 57 matching lines @@
   INPUT_EVENT_LATENCY_FORWARD_SCROLL_UPDATE_TO_MAIN_COMPONENT,
   // Timestamp when the event's ack is received by the RWH.
   INPUT_EVENT_LATENCY_ACK_RWH_COMPONENT,
   // Frame number when a browser snapshot was requested. The snapshot
   // is taken when the rendering results actually reach the screen.
   BROWSER_SNAPSHOT_FRAME_NUMBER_COMPONENT,
   // Timestamp when a tab is requested to be shown.
   TAB_SHOW_COMPONENT,
   // Timestamp when the frame is swapped in renderer.
   INPUT_EVENT_LATENCY_RENDERER_SWAP_COMPONENT,
-  // Timestamp of when the browser process receives a buffer swap notification
-  // from the renderer.
-  INPUT_EVENT_BROWSER_RECEIVED_RENDERER_SWAP_COMPONENT,
+  // Timestamp of when the display compositor receives a compositor frame from
+  // the renderer.
+  // Display compositor can be either in the browser process or in Mus.
+  DISPLAY_COMPOSITOR_RECEIVED_FRAME_COMPONENT,
   // Timestamp of when the gpu service began swap buffers, unlike
   // INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT which measures after.
   INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT,
   // Timestamp of when the gesture scroll update is generated from a mouse wheel
   // event.
   INPUT_EVENT_LATENCY_GENERATE_SCROLL_UPDATE_FROM_MOUSE_WHEEL,
   // ---------------------------TERMINAL COMPONENT-----------------------------
   // Timestamp when the event is acked from renderer when it does not
   // cause any rendering to be scheduled.
   INPUT_EVENT_LATENCY_TERMINATED_NO_SWAP_COMPONENT,
@@ skipping 14 matching lines @@
 };
 
 enum SourceEventType {
   UNKNOWN,
   WHEEL,
   TOUCH,
   OTHER,
   SOURCE_EVENT_TYPE_LAST = OTHER,
 };
 
+const char* GetComponentName(ui::LatencyComponentType type);
+
 class 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 43 matching lines @@
   // 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
 };
 
+// This is declared here for use in gtest-based unit tests, but is defined in
+// //ui/latency:test_support target.
+// Without this the default PrintTo template in gtest tries to pass LatencyInfo
+// by value, which leads to an alignment compile error on Windows.
+void PrintTo(const LatencyInfo& latency, ::std::ostream* os);
+
 }  // namespace ui
 
 #endif  // UI_LATENCY_LATENCY_INFO_H_