Implement frame attribution (FrameBlamer)

components/scheduler/renderer/renderer_scheduler_impl.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 "components/scheduler/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 1110 matching lines @@
   AnyThread().user_model.Reset(helper_.scheduler_tqm_delegate()->NowTicks());
   AnyThread().have_seen_touchstart = false;
   MainThreadOnly().loading_task_cost_estimator.Clear();
   MainThreadOnly().timer_task_cost_estimator.Clear();
   MainThreadOnly().idle_time_estimator.Clear();
   MainThreadOnly().have_seen_a_begin_main_frame = false;
   MainThreadOnly().have_reported_blocking_intervention_since_navigation = false;
   UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
 }
 
+void RendererSchedulerImpl::SetThreadBlameContext(
+    base::trace_event::BlameContext* blame_context) {
+  // Any task that runs in the default task runners belongs to the context of
+  // the current thread (as opposed to a particular frame). Note that the task
+  // itself may still enter a more specific blame context if necessary.
+  control_task_runner_->SetBlameContext(blame_context);
+  DefaultTaskRunner()->SetBlameContext(blame_context);
+  default_loading_task_runner_->SetBlameContext(blame_context);
+  default_timer_task_runner_->SetBlameContext(blame_context);
+  compositor_task_runner_->SetBlameContext(blame_context);
+  idle_helper_.IdleTaskRunner()->SetBlameContext(blame_context);

[alex clarke (OOO till 29th), 2016/03/21 14:38:36]

Maybe add a note that loading_task_runners_ and timer_task_runners_ are dealt
with separately.

[Sami, 2016/03/21 15:18:05]

Done.

+}
+
 void RendererSchedulerImpl::RegisterTimeDomain(TimeDomain* time_domain) {
   helper_.RegisterTimeDomain(time_domain);
 }
 
 void RendererSchedulerImpl::UnregisterTimeDomain(TimeDomain* time_domain) {
   helper_.UnregisterTimeDomain(time_domain);
 }
 
 void RendererSchedulerImpl::SetExpensiveTaskBlockingAllowed(bool allowed) {
   MainThreadOnly().expensive_task_blocking_allowed = allowed;
@@ skipping 39 matching lines @@
     }
     MainThreadOnly().have_reported_blocking_intervention_since_navigation =
         true;
     BroadcastConsoleWarning(
         "Deferred long-running timer task(s) to improve scrolling smoothness. "
         "See crbug.com/574343.");
   }
 }
 
 }  // namespace scheduler