scheduler: Turn expensive task blocking into a finch trial

components/scheduler/renderer/renderer_scheduler_impl_unittest.cc

Index: components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
diff --git a/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc b/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
index 4e7dfc59805199af4315e73e400cf3c01934f748..31b24a88b2c090b51da46b504bb692f9d7c6677c 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
@@ -2231,6 +2231,32 @@ TEST_F(RendererSchedulerImplTest, ExpensiveTimerTaskBlocked) {
   EXPECT_THAT(run_order, testing::ElementsAre(std::string("D1")));
 }
 
+TEST_F(RendererSchedulerImplTest, ExpensiveTimerTaskNotBlockedIfDisallowed) {
+  std::vector<std::string> run_order;
+
+  EnableTaskBlocking();
+  scheduler_->SetExpensiveTaskBlockingAllowed(false);
+  scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
+  DoMainFrame();
+  SimulateExpensiveTasks(timer_task_runner_);
+  ForceTouchStartToBeExpectedSoon();
+
+  scheduler_->DidHandleInputEventOnCompositorThread(
+      FakeInputEvent(blink::WebInputEvent::GestureFlingStart),
+      RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
+  PostTestTasks(&run_order, "T1 D1");
+  RunUntilIdle();
+
+  EXPECT_EQ(UseCase::MAIN_THREAD_GESTURE,
+            ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_TRUE(HaveSeenABeginMainframe());
+  EXPECT_FALSE(LoadingTasksSeemExpensive());
+  EXPECT_TRUE(TimerTasksSeemExpensive());
+  EXPECT_TRUE(TouchStartExpectedSoon());
+  EXPECT_THAT(run_order, testing::ElementsAre(std::string("T1"),
+                                              std::string("D1")));
+}
+
 TEST_F(RendererSchedulerImplTest,
        ExpensiveTimerTaskBlockedIfTouchStartNotSeen) {
   std::vector<std::string> run_order;