[scheduler] Implement time-based cpu throttling.

third_party/WebKit/Source/platform/scheduler/renderer/throttled_time_domain.cc

Index: third_party/WebKit/Source/platform/scheduler/renderer/throttled_time_domain.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/throttled_time_domain.cc b/third_party/WebKit/Source/platform/scheduler/renderer/throttled_time_domain.cc
index d39bf3fca0330487d1fccfe281b21f2174e9a2fa..8f6887cbbf7945f4728d5260322c13c40756a69c 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/throttled_time_domain.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/throttled_time_domain.cc
@@ -19,7 +19,7 @@ const char* ThrottledTimeDomain::GetName() const {
 
 void ThrottledTimeDomain::RequestWakeup(base::TimeTicks now,
                                         base::TimeDelta delay) {
-  // We assume the owner (i.e. ThrottlingHelper) will manage wakeups on our
+  // We assume the owner (i.e. TaskQueueThrottler) will manage wakeups on our
   // behalf.
 }
 
@@ -33,7 +33,8 @@ bool ThrottledTimeDomain::MaybeAdvanceTime() {
     return true;  // Causes DoWork to post a continuation.
 
   // Unlike RealTimeDomain::MaybeAdvanceTime we don't request a wake up here, we
-  // assume the owner (i.e. ThrottlingHelper) will manage wakeups on our behalf.
+  // assume the owner (i.e. TaskQueueThrottler) will manage wakeups on our
+  // behalf.
   return false;
 }