Change input latency result to depend on start of GPU swap

content/browser/compositor/software_browser_compositor_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 "content/browser/compositor/software_browser_compositor_output_surface.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "cc/output/compositor_frame.h"
@@ skipping 16 matching lines @@
                                      surface_id,
                                      output_surface_map,
                                      vsync_manager),
       output_surface_proxy_(surface_proxy) {}
 
 SoftwareBrowserCompositorOutputSurface::
     ~SoftwareBrowserCompositorOutputSurface() {}
 
 void SoftwareBrowserCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
-  for (size_t i = 0; i < frame->metadata.latency_info.size(); i++) {
-    frame->metadata.latency_info[i].AddLatencyNumber(
-        ui::INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT, 0, 0);
+  base::TimeTicks swap_time = base::TimeTicks::Now();
+  for (auto& latency : frame->metadata.latency_info) {
+    latency.AddLatencyNumberWithTimestamp(
+        ui::INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT, 0, 0, swap_time, 1);
+    latency.AddLatencyNumberWithTimestamp(
+        ui::INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT, 0, 0,
+        swap_time, 1);
   }
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(
           &RenderWidgetHostImpl::CompositorFrameDrawn,
           frame->metadata.latency_info));
 
   gfx::VSyncProvider* vsync_provider = software_device()->GetVSyncProvider();
   if (vsync_provider) {
     vsync_provider->GetVSyncParameters(
@@ skipping 15 matching lines @@
 void SoftwareBrowserCompositorOutputSurface::OnSurfaceRecycled() {
 }
 
 bool SoftwareBrowserCompositorOutputSurface::ShouldNotShowFramesAfterRecycle()
     const {
   return false;
 }
 #endif
 
 }  // namespace content