cc: Introduce BeginFrame sequence numbers and acknowledgements.

cc/scheduler/scheduler_unittest.cc

 // Copyright 2011 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 "cc/scheduler/scheduler.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
@@ skipping 218 matching lines @@
   EXTERNAL_BFS,
   UNTHROTTLED_BFS,
   THROTTLED_BFS,
 };
 
 class SchedulerTest : public testing::Test {
  public:
   SchedulerTest()
       : now_src_(new base::SimpleTestTickClock()),
         task_runner_(new OrderedSimpleTaskRunner(now_src_.get(), true)),
-        fake_external_begin_frame_source_(nullptr) {
+        fake_external_begin_frame_source_(nullptr),
+        next_begin_frame_number_(BeginFrameArgs::kStartingFrameNumber) {
     now_src_->Advance(base::TimeDelta::FromMicroseconds(10000));
     // A bunch of tests require NowTicks()
     // to be > BeginFrameArgs::DefaultInterval()
     now_src_->Advance(base::TimeDelta::FromMilliseconds(100));
     // Fail if we need to run 100 tasks in a row.
     task_runner_->SetRunTaskLimit(100);
   }
 
   ~SchedulerTest() override {}
 
@@ skipping 148 matching lines @@
       task_runner_->RunTasksWhile(client_->FrameHasNotAdvancedCallback());
     }
   }
 
   BeginFrameArgs SendNextBeginFrame() {
     DCHECK_EQ(scheduler_->begin_frame_source(),
               fake_external_begin_frame_source_.get());
     // Creep the time forward so that any BeginFrameArgs is not equal to the
     // last one otherwise we violate the BeginFrameSource contract.
     now_src_->Advance(BeginFrameArgs::DefaultInterval());
-    BeginFrameArgs args =
-        CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, now_src());
+    BeginFrameArgs args = CreateBeginFrameArgsForTesting(
+        BEGINFRAME_FROM_HERE, fake_external_begin_frame_source_->source_id(),
+        next_begin_frame_number_++, now_src());
     fake_external_begin_frame_source_->TestOnBeginFrame(args);
     return args;
   }
 
   FakeExternalBeginFrameSource* fake_external_begin_frame_source() const {
     return fake_external_begin_frame_source_.get();
   }
 
   void AdvanceAndMissOneFrame();
   void CheckMainFrameSkippedAfterLateCommit(bool expect_send_begin_main_frame);
   void ImplFrameSkippedAfterLateAck(bool receive_ack_before_deadline);
   void ImplFrameNotSkippedAfterLateAck();
   void BeginFramesNotFromClient(BeginFrameSourceType bfs_type);
   void BeginFramesNotFromClient_IsDrawThrottled(BeginFrameSourceType bfs_type);
   bool BeginMainFrameOnCriticalPath(TreePriority tree_priority,
                                     ScrollHandlerState scroll_handler_state,
                                     base::TimeDelta durations);
 
   std::unique_ptr<base::SimpleTestTickClock> now_src_;
   scoped_refptr<OrderedSimpleTaskRunner> task_runner_;
   std::unique_ptr<FakeExternalBeginFrameSource>
       fake_external_begin_frame_source_;
   std::unique_ptr<SyntheticBeginFrameSource> synthetic_frame_source_;
   std::unique_ptr<SyntheticBeginFrameSource> unthrottled_frame_source_;
   SchedulerSettings scheduler_settings_;
   std::unique_ptr<FakeSchedulerClient> client_;
   std::unique_ptr<TestScheduler> scheduler_;
   FakeCompositorTimingHistory* fake_compositor_timing_history_;
+  uint64_t next_begin_frame_number_;
 };
 
 TEST_F(SchedulerTest, InitializeCompositorFrameSinkDoesNotBeginImplFrame) {
   SetUpSchedulerWithNoCompositorFrameSink(EXTERNAL_BFS);
   scheduler_->SetVisible(true);
   scheduler_->SetCanDraw(true);
 
   EXPECT_SINGLE_ACTION("ScheduledActionBeginCompositorFrameSinkCreation",
                        client_);
   client_->Reset();
@@ skipping 877 matching lines @@
   // if it can activate before the deadline.
   SetUpScheduler(EXTERNAL_BFS);
   fake_compositor_timing_history_->SetAllEstimatesTo(kFastDuration);
 
   AdvanceAndMissOneFrame();
   EXPECT_TRUE(scheduler_->MainThreadMissedLastDeadline());
   scheduler_->SetNeedsBeginMainFrame();
 
   // Advance frame and create a begin frame.
   now_src_->Advance(BeginFrameArgs::DefaultInterval());
-  BeginFrameArgs args =
-      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, now_src());
+  BeginFrameArgs args = CreateBeginFrameArgsForTesting(
+      BEGINFRAME_FROM_HERE, fake_external_begin_frame_source_->source_id(),
+      next_begin_frame_number_++, now_src());
 
   // Deliver this begin frame super late.
   now_src_->Advance(BeginFrameArgs::DefaultInterval() * 100);
   fake_external_begin_frame_source_->TestOnBeginFrame(args);
 
   task_runner().RunTasksWhile(client_->InsideBeginImplFrame(true));
   EXPECT_EQ(true, scheduler_->MainThreadMissedLastDeadline());
   EXPECT_ACTION("WillBeginImplFrame", client_, 0, 3);
   EXPECT_ACTION("ScheduledActionSendBeginMainFrame", client_, 1, 3);
   EXPECT_ACTION("ScheduledActionDrawIfPossible", client_, 2, 3);
@@ skipping 1924 matching lines @@
 }
 
 TEST_F(SchedulerTest, BeginMainFrameOnCriticalPath_AHS) {
   EXPECT_FALSE(BeginMainFrameOnCriticalPath(
       SMOOTHNESS_TAKES_PRIORITY,
       ScrollHandlerState::SCROLL_AFFECTS_SCROLL_HANDLER, kSlowDuration));
 }
 
 }  // namespace
 }  // namespace cc