[scheduler] Teach scheduler about audio state

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index f87b5b293c8a5ec25559250d02028530a02f06e8..e572efe2517f4e710214bac4cce57cb263557021 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -1120,6 +1120,8 @@ component("platform") {
     "scheduler/CancellableTaskFactory.h",
     "scheduler/base/cancelable_closure_holder.cc",
     "scheduler/base/cancelable_closure_holder.h",
+    "scheduler/base/delayed_switch.cc",
+    "scheduler/base/delayed_switch.h",
     "scheduler/base/enqueue_order.cc",
     "scheduler/base/enqueue_order.h",
     "scheduler/base/lazy_now.cc",
@@ -1693,6 +1695,7 @@ test("blink_platform_unittests") {
     "network/ResourceRequestTest.cpp",
     "network/ResourceResponseTest.cpp",
     "scheduler/CancellableTaskFactoryTest.cpp",
+    "scheduler/base/delayed_switch_unittest.cc",
     "scheduler/base/queueing_time_estimator_unittest.cc",
     "scheduler/base/task_queue_manager_unittest.cc",
     "scheduler/base/task_queue_selector_unittest.cc",