WIP: Plumbing input event latency reporting through Mus GPU.

services/ui/surfaces/display_output_surface.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 "services/ui/surfaces/display_output_surface.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/output_surface_client.h"
 #include "cc/output/output_surface_frame.h"
 #include "cc/scheduler/begin_frame_source.h"
 #include "gpu/command_buffer/client/context_support.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/ipc/gl_in_process_context.h"
+#include "components/latency_tracker/latency_tracker.h"
 
 namespace ui {
 
 DisplayOutputSurface::DisplayOutputSurface(
     scoped_refptr<cc::InProcessContextProvider> context_provider,
     cc::SyntheticBeginFrameSource* synthetic_begin_frame_source)
     : cc::OutputSurface(context_provider),
       synthetic_begin_frame_source_(synthetic_begin_frame_source),
+      latency_tracker_(new latency_tracker::LatencyTracker),
       weak_ptr_factory_(this) {
   capabilities_.flipped_output_surface =
       context_provider->ContextCapabilities().flips_vertically;
   capabilities_.supports_stencil =
       context_provider->ContextCapabilities().num_stencil_bits > 0;
   context_provider->SetSwapBuffersCompletionCallback(
       base::Bind(&DisplayOutputSurface::OnGpuSwapBuffersCompleted,
                  weak_ptr_factory_.GetWeakPtr()));
   context_provider->SetUpdateVSyncParametersCallback(
       base::Bind(&DisplayOutputSurface::OnVSyncParametersUpdated,
                  weak_ptr_factory_.GetWeakPtr()));
+  in_process_command_buffer_ = context_provider->context()->GetInProcessCommandBuffer();
 }
 
 DisplayOutputSurface::~DisplayOutputSurface() {}
 
 void DisplayOutputSurface::BindToClient(cc::OutputSurfaceClient* client) {
   DCHECK(client);
   DCHECK(!client_);
   client_ = client;
 }
 
@@ skipping 25 matching lines @@
                                    bool has_alpha,
                                    bool use_stencil) {
   size_ = size;
   has_set_draw_rectangle_since_last_resize_ = false;
   context_provider()->ContextGL()->ResizeCHROMIUM(
       size.width(), size.height(), device_scale_factor, has_alpha);
 }
 
 void DisplayOutputSurface::SwapBuffers(cc::OutputSurfaceFrame frame) {
   DCHECK(context_provider_);
+
+  if (frame.latency_info.size() > 0)
+    in_process_command_buffer_->SetLatencyInfo(frame.latency_info);

[mfomitchev, 2017/03/23 15:25:17]

This is why I need these new methods.

[Fady Samuel, 2017/03/23 17:24:38]

How about plumbing this through ContextProvider instead. I think we don't want
to expose InProcessCommandBuffer directly? 

+
   set_draw_rectangle_for_frame_ = false;
   if (frame.sub_buffer_rect) {
     context_provider_->ContextSupport()->PartialSwapBuffers(
         *frame.sub_buffer_rect);
   } else {
-    context_provider_->ContextSupport()->Swap();
+    context_provider_->ContextSupport()->Swap(/*frame.latency_info*/);
   }
 }
 
 uint32_t DisplayOutputSurface::GetFramebufferCopyTextureFormat() {
   // TODO(danakj): What attributes are used for the default framebuffer here?
   // Can it have alpha? cc::InProcessContextProvider doesn't take any
   // attributes.
   return GL_RGB;
 }
 
@@ skipping 21 matching lines @@
 void DisplayOutputSurface::ApplyExternalStencil() {}
 
 void DisplayOutputSurface::DidReceiveSwapBuffersAck(gfx::SwapResult result) {
   client_->DidReceiveSwapBuffersAck();
 }
 
 void DisplayOutputSurface::OnGpuSwapBuffersCompleted(
     const std::vector<ui::LatencyInfo>& latency_info,
     gfx::SwapResult result,
     const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac) {
+  for (const auto& lat_elt : latency_info) {
+    for (const auto& lc : lat_elt.latency_components()) {
+      // TODO: Make this check a method in LatencyTracker, also use it in RWHImpl?
+      if (lc.first.first == ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT ||
+          lc.first.first == ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT ||
+          lc.first.first == ui::TAB_SHOW_COMPONENT) {
+        // TODO(mfomitchev): Figure out how to pass the proper value for
+        // |is_running_navigation_hint_task|.
+        latency_tracker_->OnGpuSwapBufersCompleted(lat_elt, false);
+      }
+    }
+  }
   DidReceiveSwapBuffersAck(result);
 }
 
 void DisplayOutputSurface::OnVSyncParametersUpdated(base::TimeTicks timebase,
                                                     base::TimeDelta interval) {
   // TODO(brianderson): We should not be receiving 0 intervals.
   synthetic_begin_frame_source_->OnUpdateVSyncParameters(
       timebase,
       interval.is_zero() ? cc::BeginFrameArgs::DefaultInterval() : interval);
 }
 
 }  // namespace ui