Implement frame attribution (FrameBlamer)

components/scheduler/renderer/renderer_scheduler_impl.cc

Index: components/scheduler/renderer/renderer_scheduler_impl.cc
diff --git a/components/scheduler/renderer/renderer_scheduler_impl.cc b/components/scheduler/renderer/renderer_scheduler_impl.cc
index 91069dec8559003111c43b5d68210d33c7255bdf..9f66b3d8f2125f62f327fe5c57b9ccf5c0fb6427 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl.cc
@@ -1128,6 +1128,19 @@ void RendererSchedulerImpl::ResetForNavigationLocked() {
   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);
 }