[scheduler] Teach scheduler about audio state

third_party/WebKit/Source/platform/scheduler/base/delayed_switch.cc

Index: third_party/WebKit/Source/platform/scheduler/base/delayed_switch.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/base/delayed_switch.cc b/third_party/WebKit/Source/platform/scheduler/base/delayed_switch.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a6dcb557c704cdbb99f2cbea4c959838f0cc4326
--- /dev/null
+++ b/third_party/WebKit/Source/platform/scheduler/base/delayed_switch.cc
@@ -0,0 +1,69 @@
+// Copyright 2016 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 "platform/scheduler/base/delayed_switch.h"
+
+#include "base/task_runner.h"
+
+namespace blink {
+namespace scheduler {
+
+DelayedSwitch::DelayedSwitch(
+    base::TaskRunner* task_runner,
+    base::TimeDelta disable_delay,
+    base::Closure enable_callback,
+    base::Closure disable_callback)
+  : state_(State::DISABLED),
+    task_runner_(task_runner),
+    disable_delay_(disable_delay),
+    enable_callback_(enable_callback),
+    disable_callback_(disable_callback),
+    has_disable_task_queued_(false),
+    weak_ptr_factory_(this) {
+  delayed_disable_task_.Reset(base::Bind(
+        &DelayedSwitch::DoDisable, weak_ptr_factory_.GetWeakPtr()));
+}
+
+DelayedSwitch::~DelayedSwitch() {}
+
+void DelayedSwitch::Enable() {
+  // Cancel queued call to |disable_callback|.
+  delayed_disable_task_.Cancel();

[alex clarke (OOO till 29th), 2016/09/29 11:16:53]

DCHECK(task_runner_->RunsTasksOnCurrentThread());

[altimin, 2016/09/29 16:29:42]

Acknowledged.

+  has_disable_task_queued_ = false;
+
+  if (state_ == State::ENABLED)
+    return;
+
+  state_ = State::ENABLED;
+
+  enable_callback_.Run();
+}
+
+void DelayedSwitch::Disable() {
+  if (state_ == State::DISABLED)

[alex clarke (OOO till 29th), 2016/09/29 11:16:53]

DCHECK(task_runner_->RunsTasksOnCurrentThread());

[altimin, 2016/09/29 16:29:42]

Acknowledged.

+    return;
+
+  if (has_disable_task_queued_)
+    return;
+
+  task_runner_->PostDelayedTask(
+      FROM_HERE, delayed_disable_task_.callback(), disable_delay_);
+  has_disable_task_queued_ = true;
+}
+
+bool DelayedSwitch::IsEnabled() const {
+  return state_ == State::ENABLED;

[alex clarke (OOO till 29th), 2016/09/29 11:16:53]

DCHECK(task_runner_->RunsTasksOnCurrentThread());

[altimin, 2016/09/29 16:29:42]

Acknowledged.

+}
+
+void DelayedSwitch::DoDisable() {
+  has_disable_task_queued_ = false;
+
+  DCHECK_EQ(State::ENABLED, state_);

[Sami, 2016/09/29 13:36:07]

Does this work? If so, please mark
https://bugs.chromium.org/p/chromium/issues/detail?id=463869 as fixed :)

[altimin, 2016/09/29 16:29:42]

Done.

+  state_ = State::DISABLED;
+
+  disable_callback_.Run();
+}
+
+}  // namespace scheduler
+}  // namespace blink