scheduler: Disable expensive task blocking policy in M48

components/scheduler/renderer/renderer_scheduler_impl.cc

Index: components/scheduler/renderer/renderer_scheduler_impl.cc
diff --git a/components/scheduler/renderer/renderer_scheduler_impl.cc b/components/scheduler/renderer/renderer_scheduler_impl.cc
index 499d66203cbdc81e638914d8d87121a6b56a9ab9..b1e547765f4e3f924d2461806bc157dcd6549212 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl.cc
@@ -715,6 +715,10 @@ void RendererSchedulerImpl::UpdatePolicyLocked(UpdateType update_type) {
     block_expensive_timer_tasks = false;
   }
 
+  // Expensive task blocking is currently disabled (crbug.com/574343).
+  block_expensive_loading_tasks = false;
+  block_expensive_timer_tasks = false;
+
   // Only block expensive tasks if we have seen a touch start, i.e. don't block
   // expensive timers on desktop because it's causing too many problems with
   // legitimate webcontent using mousehandlers for various things.