scheduler: Don't block expensive loading tasks during main thread gestures

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 7e339c2169f1505e38b342d1cd322691becd01f4..2f951ab4ad65c064bf9fcf5c6ac472b33085be89 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
@@ -2150,6 +2150,26 @@ TEST_F(
   EXPECT_THAT(run_order, testing::ElementsAre(std::string("D1")));
 }
 
+TEST_F(
+    RendererSchedulerImplTest,
+    TestCompositorPolicy_ExpensiveLoadingTasksNotBlockedDuringMainThreadGestures) {

[alex clarke (OOO till 29th), 2015/10/30 14:55:23]

Please shorten this.

[Sami, 2015/10/30 15:01:20]

Done.

+  std::vector<std::string> run_order;
+
+  SimulateExpensiveTasks(loading_task_runner_);
+
+  // Loading tasks should not be disabled during main thread user user
+  // interactions.
+  PostTestTasks(&run_order, "C1 L1");
+
+  // Trigger main_thread_gesture UseCase
+  WillBeginMainThreadGestureFrame();
+  RunUntilIdle();
+  EXPECT_EQ(RendererScheduler::UseCase::MAIN_THREAD_GESTURE, CurrentUseCase());
+
+  EXPECT_THAT(run_order,

[alex clarke (OOO till 29th), 2015/10/30 14:55:23]

Please add:

 EXPECT_TRUE(LoadingTasksSeemExpensive());
 EXPECT_FALSE(TimerTasksSeemExpensive());

[Sami, 2015/10/30 15:01:20]

Done.

+              testing::ElementsAre(std::string("C1"), std::string("L1")));
+}
+
 TEST_F(RendererSchedulerImplTest, ModeratelyExpensiveTimer_NotBlocked) {
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   for (int i = 0; i < 20; i++) {