[scheduler] Add unthrottled-by-blockable task queue to fix touch latency regression.

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

Index: third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc
index 3dce41cf092a2bb4172303c34e7ae41b59eb6ef3..0f7f669ebfb0431879a0e63708a9dc7f76f6a8b2 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc
@@ -178,7 +178,7 @@ RefPtr<blink::WebTaskRunner> WebFrameSchedulerImpl::SuspendableTaskRunner() {
 RefPtr<blink::WebTaskRunner> WebFrameSchedulerImpl::UnthrottledTaskRunner() {
   DCHECK(parent_web_view_scheduler_);
   if (!unthrottled_web_task_runner_) {
-    unthrottled_task_queue_ = renderer_scheduler_->NewUnthrottledTaskQueue(
+    unthrottled_task_queue_ = renderer_scheduler_->NewTimerTaskQueue(
         TaskQueue::QueueType::FRAME_UNTHROTTLED);
     unthrottled_task_queue_->SetBlameContext(blame_context_);
     unthrottled_web_task_runner_ =
@@ -187,6 +187,17 @@ RefPtr<blink::WebTaskRunner> WebFrameSchedulerImpl::UnthrottledTaskRunner() {
   return unthrottled_web_task_runner_;
 }
 
+RefPtr<blink::WebTaskRunner> WebFrameSchedulerImpl::GeneralTaskRunner() {
+  DCHECK(parent_web_view_scheduler_);
+  if (!general_web_task_runner_) {
+    general_task_queue_ = renderer_scheduler_->NewUnthrottledTaskQueue(
+        TaskQueue::QueueType::FRAME_UNTHROTTLED);
+    general_task_queue_->SetBlameContext(blame_context_);
+    general_web_task_runner_ = WebTaskRunnerImpl::Create(general_task_queue_);
+  }
+  return general_web_task_runner_;
+}
+
 blink::WebViewScheduler* WebFrameSchedulerImpl::GetWebViewScheduler() {
   return parent_web_view_scheduler_;
 }