Reland "Throttle resource message requests during user interaction"

content/renderer/scheduler/renderer_scheduler_impl_unittest.cc

Index: content/renderer/scheduler/renderer_scheduler_impl_unittest.cc
diff --git a/content/renderer/scheduler/renderer_scheduler_impl_unittest.cc b/content/renderer/scheduler/renderer_scheduler_impl_unittest.cc
index 36c85d3cf698afa5e30ae98609ae864efea56d30..47cff1c3c6b719e8bc638fe9cb6e987c1b3d0aea 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl_unittest.cc
+++ b/content/renderer/scheduler/renderer_scheduler_impl_unittest.cc
@@ -49,6 +49,11 @@ class RendererSchedulerImplTest : public testing::Test {
   }
 
  protected:
+  static base::TimeDelta compositor_priority_after_touch_duration() {
+    return base::TimeDelta::FromMilliseconds(
+        RendererSchedulerImpl::kCompositorPriorityAfterTouchMillis);
+  }
+
   scoped_refptr<cc::TestNowSource> clock_;
   scoped_refptr<cc::OrderedSimpleTaskRunner> mock_task_runner_;
 
@@ -145,6 +150,18 @@ void PostingYieldingTestTask(
   *should_yield_after = scheduler->ShouldYieldForHighPriorityWork();
 }
 
+void AnticipationTestTask(RendererSchedulerImpl* scheduler,
+                          bool simulate_input,
+                          bool* is_anticipated_before,
+                          bool* is_anticipated_after) {
+  *is_anticipated_before = scheduler->IsHighPriorityWorkAnticipated();
+  if (simulate_input) {
+    scheduler->DidReceiveInputEventOnCompositorThread(
+        blink::WebInputEvent::GestureFlingStart);
+  }
+  *is_anticipated_after = scheduler->IsHighPriorityWorkAnticipated();
+}
+
 TEST_F(RendererSchedulerImplTest, TestPostDefaultTask) {
   int result = 0;
   default_task_runner_->PostTask(FROM_HERE,
@@ -512,6 +529,45 @@ TEST_F(RendererSchedulerImplTest, TestCompositorPolicyEnds) {
                                    std::string("D2"), std::string("C2")));
 }
 
+TEST_F(RendererSchedulerImplTest, TestIsHighPriorityWorkAnticipated) {
+  bool is_anticipated_before = false;
+  bool is_anticipated_after = false;
+
+  bool simulate_input = false;
+  default_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&AnticipationTestTask, scheduler_.get(), simulate_input,
+                 &is_anticipated_before, &is_anticipated_after));
+  RunUntilIdle();
+  // In its default state, without input receipt, the scheduler should indicate
+  // that no high-priority is anticipated.
+  EXPECT_FALSE(is_anticipated_before);
+  EXPECT_FALSE(is_anticipated_after);
+
+  simulate_input = true;
+  default_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&AnticipationTestTask, scheduler_.get(), simulate_input,
+                 &is_anticipated_before, &is_anticipated_after));
+  RunUntilIdle();
+  // When input is received, the scheduler should indicate that high-priority
+  // work is anticipated.
+  EXPECT_FALSE(is_anticipated_before);
+  EXPECT_TRUE(is_anticipated_after);
+
+  clock_->AdvanceNow(compositor_priority_after_touch_duration() * 2);
+  simulate_input = false;
+  default_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&AnticipationTestTask, scheduler_.get(), simulate_input,
+                 &is_anticipated_before, &is_anticipated_after));
+  RunUntilIdle();
+  // Without additional input, the scheduler should indicate that high-priority
+  // work is no longer anticipated.
+  EXPECT_FALSE(is_anticipated_before);
+  EXPECT_FALSE(is_anticipated_after);
+}
+
 TEST_F(RendererSchedulerImplTest, TestShouldYield) {
   bool should_yield_before = false;
   bool should_yield_after = false;