Teach MainThreadEventQueue about touchmove throttling.

content/renderer/input/main_thread_event_queue_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include <new>
 #include <utility>
 #include <vector>
 
@@ skipping 24 matching lines @@
   return memcmp(&lhs, &rhs, lhs.size()) == 0;
 }
 }  // namespace blink
 
 namespace content {
 namespace {
 
 const unsigned kRafAlignedEnabledTouch = 1;
 const unsigned kRafAlignedEnabledMouse = 1 << 1;
 
+// Simulate a 16ms frame signal.
+const double kFrameInterval = 0.016;
+
 const int kTestRoutingID = 13;
 const char* kCoalescedCountHistogram =
     "Event.MainThreadEventQueue.CoalescedCount";
 
 }  // namespace
 
 class MainThreadEventQueueTest : public testing::TestWithParam<unsigned>,
                                  public MainThreadEventQueueClient {
  public:
   MainThreadEventQueueTest()
       : main_task_runner_(new base::TestSimpleTaskRunner()),
         raf_aligned_input_setting_(GetParam()),
-        needs_main_frame_(false) {
+        needs_main_frame_(false),
+        frame_time_sec_(0) {
     std::vector<std::string> features;
     if (raf_aligned_input_setting_ & kRafAlignedEnabledTouch)
       features.push_back(features::kRafAlignedTouchInputEvents.name);
     if (raf_aligned_input_setting_ & kRafAlignedEnabledMouse)
       features.push_back(features::kRafAlignedMouseInputEvents.name);
 
     feature_list_.InitFromCommandLine(base::JoinString(features, ","),
                                       std::string());
   }
 
@@ skipping 39 matching lines @@
   }
 
   void set_enable_fling_passive_listener_flag(bool enable_flag) {
     queue_->enable_fling_passive_listener_flag_ = enable_flag;
   }
 
   void RunPendingTasksWithSimulatedRaf() {
     while (needs_main_frame_ || main_task_runner_->HasPendingTask()) {
       main_task_runner_->RunUntilIdle();
       needs_main_frame_ = false;
-      queue_->DispatchRafAlignedInput();
+      frame_time_sec_ += kFrameInterval;
+      queue_->DispatchRafAlignedInput(frame_time_sec_);
     }
   }
 
   void RunSimulatedRafOnce() {
     if (needs_main_frame_) {
       needs_main_frame_ = false;
-      queue_->DispatchRafAlignedInput();
+      frame_time_sec_ += kFrameInterval;
+      queue_->DispatchRafAlignedInput(frame_time_sec_);
     }
   }
 
  protected:
   base::test::ScopedFeatureList feature_list_;
   scoped_refptr<base::TestSimpleTaskRunner> main_task_runner_;
   blink::scheduler::MockRendererScheduler renderer_scheduler_;
   scoped_refptr<MainThreadEventQueue> queue_;
   std::vector<blink::WebCoalescedInputEvent> handled_events_;
 
   std::vector<uint32_t> additional_acked_events_;
   int raf_aligned_input_setting_;
   bool needs_main_frame_;
+  double frame_time_sec_;
 };
 
 TEST_P(MainThreadEventQueueTest, NonBlockingWheel) {
   base::HistogramTester histogram_tester;
 
   WebMouseWheelEvent kEvents[4] = {
       SyntheticWebMouseWheelEventBuilder::Build(10, 10, 0, 53, 0, false),
       SyntheticWebMouseWheelEventBuilder::Build(20, 20, 0, 53, 0, false),
       SyntheticWebMouseWheelEventBuilder::Build(30, 30, 0, 53, 1, false),
       SyntheticWebMouseWheelEventBuilder::Build(30, 30, 0, 53, 1, false),
@@ skipping 427 matching lines @@
   EXPECT_TRUE(needs_main_frame_);
   EXPECT_TRUE(HandleEvent(kEvents[0], INPUT_EVENT_ACK_STATE_NOT_CONSUMED));
   EXPECT_EQ(1u, event_queue().size());
   EXPECT_FALSE(main_task_runner_->HasPendingTask());
   EXPECT_TRUE(needs_main_frame_);
   RunPendingTasksWithSimulatedRaf();
   EXPECT_EQ(0u, event_queue().size());
   EXPECT_EQ(0u, additional_acked_events_.size());
 }
 
+TEST_P(MainThreadEventQueueTest, RafAlignedTouchInputThrottlingMoves) {
+  // Don't run the test when we aren't supporting rAF aligned input.
+  if ((raf_aligned_input_setting_ & kRafAlignedEnabledTouch) == 0)
+    return;
+
+  SyntheticWebTouchEvent kEvents[2];
+  kEvents[0].PressPoint(10, 10);
+  kEvents[0].MovePoint(0, 50, 50);
+  kEvents[0].dispatchType = WebInputEvent::EventNonBlocking;
+  kEvents[1].PressPoint(10, 10);
+  kEvents[1].MovePoint(0, 20, 20);
+  kEvents[1].dispatchType = WebInputEvent::EventNonBlocking;
+
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_EQ(0u, event_queue().size());
+
+  // Send a non-cancelable touch move and then send it another one. The
+  // second one shouldn't go out with the next rAF call and should be throttled.
+  EXPECT_TRUE(HandleEvent(kEvents[0], INPUT_EVENT_ACK_STATE_NOT_CONSUMED));
+  EXPECT_EQ(1u, event_queue().size());
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_TRUE(needs_main_frame_);
+  RunPendingTasksWithSimulatedRaf();
+  EXPECT_TRUE(HandleEvent(kEvents[0], INPUT_EVENT_ACK_STATE_NOT_CONSUMED));
+  EXPECT_TRUE(HandleEvent(kEvents[1], INPUT_EVENT_ACK_STATE_NOT_CONSUMED));
+  EXPECT_EQ(1u, event_queue().size());
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_TRUE(needs_main_frame_);
+
+  // Event should still be in queue after handling a single rAF call.
+  RunSimulatedRafOnce();
+  EXPECT_EQ(1u, event_queue().size());
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_TRUE(needs_main_frame_);
+
+  // And should eventually flush.
+  RunPendingTasksWithSimulatedRaf();
+  EXPECT_EQ(0u, event_queue().size());
+  EXPECT_EQ(0u, additional_acked_events_.size());
+}
+
 TEST_P(MainThreadEventQueueTest, BlockingTouchesDuringFling) {
   SyntheticWebTouchEvent kEvents;
   kEvents.PressPoint(10, 10);
   kEvents.touchStartOrFirstTouchMove = true;
   set_enable_fling_passive_listener_flag(true);
 
   EXPECT_FALSE(last_touch_start_forced_nonblocking_due_to_fling());
   HandleEvent(kEvents, INPUT_EVENT_ACK_STATE_SET_NON_BLOCKING_DUE_TO_FLING);
   RunPendingTasksWithSimulatedRaf();
   EXPECT_FALSE(main_task_runner_->HasPendingTask());
@@ skipping 180 matching lines @@
       "MainThreadResponsivenessScrollIntervention", "Control");
   queue_ = new MainThreadEventQueue(kTestRoutingID,
                                     &dummy_main_thread_event_queue_client_,
                                     main_task_runner_, &renderer_scheduler_);
   EXPECT_FALSE(enable_non_blocking_due_to_main_thread_responsiveness_flag());
   EXPECT_EQ(base::TimeDelta::FromMilliseconds(0),
             main_thread_responsiveness_threshold());
 }
 
 }  // namespace content