[scheduler] Teach scheduler about audio state

cc/test/ordered_simple_task_runner.cc

Index: cc/test/ordered_simple_task_runner.cc
diff --git a/cc/test/ordered_simple_task_runner.cc b/cc/test/ordered_simple_task_runner.cc
index a3d66ee6d3a58510e49557842b0498955f17fc83..a0271b0c19126055ad9e2610056f58703f9821a3 100644
--- a/cc/test/ordered_simple_task_runner.cc
+++ b/cc/test/ordered_simple_task_runner.cc
@@ -249,7 +249,7 @@ bool OrderedSimpleTaskRunner::RunUntilTime(base::TimeTicks time) {
 
   // If the next task is after the stopping time and auto-advancing now, then
   // force time to be the stopping time.
-  if (!result && advance_now_ && now_src_->NowTicks() < time) {
+  if (advance_now_ && now_src_->NowTicks() < time) {

[Sami, 2016/10/03 14:37:30]

Not sure why this change is needed?

[altimin, 2016/10/03 15:53:38]

tl;dr: Without this change new test does not work (RunUntilTime does not advance
time).

The problem is that currently time advance is stopped when we have any pending
task.
Guessing from tests, the initial idea was not to advance time when task limit
was reached, fixed to do so.

[Sami, 2016/10/03 16:25:29]

Yeah okay, I think it seems a little weird to not advance time if the task limit
is reached.

[altimin, 2016/10/03 16:28:22]

It kinda makes sense: please take a look at RunUntilTimeout test in [1]. 

 [1]
https://cs.chromium.org/chromium/src/cc/test/ordered_simple_task_runner_unitt...

     now_src_->Advance(time - now_src_->NowTicks());
   }