Update from https://crrev.com/312398

cc/scheduler/scheduler_unittest.cc

Index: cc/scheduler/scheduler_unittest.cc
diff --git a/cc/scheduler/scheduler_unittest.cc b/cc/scheduler/scheduler_unittest.cc
index 29e4c496f151304c2d58cf6a170edec8c2342358..ea3cf10c894d22622b709182f0cb86e20ed7914b 100644
--- a/cc/scheduler/scheduler_unittest.cc
+++ b/cc/scheduler/scheduler_unittest.cc
@@ -2318,5 +2318,34 @@ TEST(SchedulerTest, SwitchFrameSourceToThrottled) {
   EXPECT_ACTION("ScheduledActionDrawAndSwapIfPossible", client, 0, 1);
 }
 
+TEST(SchedulerTest, BeginMainFrameAbortedTriggersImmediateDeadline) {
+  FakeSchedulerClient client;
+  SchedulerSettings settings;
+  settings.use_external_begin_frame_source = true;
+
+  CREATE_SCHEDULER_AND_INIT_SURFACE(settings);
+
+  scheduler->SetNeedsCommit();
+  EXPECT_SINGLE_ACTION("SetNeedsBeginFrames(true)", client);
+  client.Reset();
+
+  client.AdvanceFrame();
+  EXPECT_ACTION("WillBeginImplFrame", client, 0, 2);
+  EXPECT_ACTION("ScheduledActionSendBeginMainFrame", client, 1, 2);
+  EXPECT_TRUE(scheduler->BeginImplFrameDeadlinePending());
+  client.Reset();
+
+  client.task_runner().RunUntilTime(client.now_src()->Now());
+  EXPECT_TRUE(scheduler->BeginImplFrameDeadlinePending());
+
+  scheduler->BeginMainFrameAborted(CommitEarlyOutReason::ABORTED_NOT_VISIBLE);
+
+  EXPECT_TRUE(scheduler->BeginImplFrameDeadlinePending());
+  client.task_runner().RunUntilTime(client.now_src()->Now());
+  EXPECT_FALSE(scheduler->BeginImplFrameDeadlinePending());
+
+  EXPECT_NO_ACTION(client);
+}
+
 }  // namespace
 }  // namespace cc