WIP: Plumbing input event latency reporting through Mus GPU.

cc/surfaces/surface_factory.cc

 // Copyright 2014 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 "cc/surfaces/surface_factory.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 29 matching lines @@
     return;
   Destroy(std::move(current_surface_));
 }
 
 void SurfaceFactory::SubmitCompositorFrame(
     const LocalSurfaceId& local_surface_id,
     CompositorFrame frame,
     const DrawCallback& callback) {
   TRACE_EVENT0("cc", "SurfaceFactory::SubmitCompositorFrame");
   DCHECK(local_surface_id.is_valid());
+
+  for (ui::LatencyInfo& latency : frame.metadata.latency_info) {
+    // TODO: These latencies need to be saved somehow.
+    // TODO: Rename INPUT_EVENT_BROWSER_RECEIVED_RENDERER_SWAP_COMPONENT
+    // TODO: Remove similar code in RWHLatencyTracker?
+    // TODO: Better if? Maybe just check if latency_info has ANY components?
+    if (latency.FindLatency(ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, nullptr) ||
+        latency.FindLatency(ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT, nullptr) ||
+        latency.FindLatency(ui::TAB_SHOW_COMPONENT, nullptr)) {
+      latency.AddLatencyNumber(
+          ui::INPUT_EVENT_BROWSER_RECEIVED_RENDERER_SWAP_COMPONENT, 0, 0);
+    }
+  }
+
   std::unique_ptr<Surface> surface;
   bool create_new_surface =
       (!current_surface_ ||
        local_surface_id != current_surface_->surface_id().local_surface_id());
   if (!create_new_surface) {
     surface = std::move(current_surface_);
   } else {
     surface = Create(local_surface_id);
   }
   surface->QueueFrame(std::move(frame), callback);
@@ skipping 88 matching lines @@
   surface->AddObserver(this);
   return surface;
 }
 
 void SurfaceFactory::Destroy(std::unique_ptr<Surface> surface) {
   surface->RemoveObserver(this);
   manager_->DestroySurface(std::move(surface));
 }
 
 }  // namespace cc