Make latency tests measure until the end of swap buffers.

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 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/renderer_host/render_widget_host_impl.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 1346 matching lines @@
 
   // Measures the time from receiving the MsgUpdateRect IPC to completing the
   // DidUpdateBackingStore() method.  On platforms which have asynchronous
   // painting, such as Linux, this is the sum of MPArch.RWH_OnMsgUpdateRect,
   // MPArch.RWH_DidUpdateBackingStore, and the time spent asynchronously
   // waiting for the paint to complete.
   //
   // On other platforms, this will be equivalent to MPArch.RWH_OnMsgUpdateRect.
   delta = now - paint_start;
   UMA_HISTOGRAM_TIMES("MPArch.RWH_TotalPaintTime", delta);
+  UNSHIPPED_TRACE_EVENT_INSTANT1("test_latency", "UpdateRectComplete",
+      "x+y", params.bitmap_rect.x() + params.bitmap_rect.y());
 }
 
 void RenderWidgetHostImpl::OnMsgInputEventAck(WebInputEvent::Type event_type,
                                               bool processed) {
   TRACE_EVENT0("renderer_host", "RenderWidgetHostImpl::OnMsgInputEventAck");
 
   // Log the time delta for processing an input event.
   TimeDelta delta = TimeTicks::Now() - input_event_start_time_;
   UMA_HISTOGRAM_TIMES("MPArch.RWH_InputEventDelta", delta);
 
@@ skipping 407 matching lines @@
   // indicate that no callback is in progress (i.e. without this line
   // DelayedAutoResized will not get called again).
   new_auto_size_.SetSize(0, 0);
   if (!should_auto_resize_)
     return;
 
   OnRenderAutoResized(new_size);
 }
 
 }  // namespace content