[heap] Report wrappers after processing the marking deque incrementally

test/unittests/heap/embedder-tracing-unittest.cc

 // Copyright 2016 the V8 project 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 "src/heap/embedder-tracing.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 117 matching lines @@
   EXPECT_EQ(1u, local_tracer.NumberOfWrappersToTrace());
 }
 
 TEST(LocalEmbedderHeapTracer, TraceFinishes) {
   LocalEmbedderHeapTracer local_tracer;
   StrictMock<MockEmbedderHeapTracer> remote_tracer;
   local_tracer.SetRemoteTracer(&remote_tracer);
   local_tracer.AddWrapperToTrace(CreateWrapperInfo());
   EXPECT_EQ(1u, local_tracer.NumberOfCachedWrappersToTrace());
   EXPECT_CALL(remote_tracer, RegisterV8References(_));
+  local_tracer.RegisterWrappersWithRemoteTracer();
   EXPECT_CALL(remote_tracer, AdvanceTracing(0, _)).WillOnce(Return(false));
   EXPECT_FALSE(local_tracer.Trace(
       0, EmbedderHeapTracer::AdvanceTracingActions(
              EmbedderHeapTracer::ForceCompletionAction::FORCE_COMPLETION)));
   EXPECT_EQ(0u, local_tracer.NumberOfCachedWrappersToTrace());
 }
 
 TEST(LocalEmbedderHeapTracer, TraceDoesNotFinish) {
   LocalEmbedderHeapTracer local_tracer;
   StrictMock<MockEmbedderHeapTracer> remote_tracer;
   local_tracer.SetRemoteTracer(&remote_tracer);
   local_tracer.AddWrapperToTrace(CreateWrapperInfo());
   EXPECT_EQ(1u, local_tracer.NumberOfCachedWrappersToTrace());
   EXPECT_CALL(remote_tracer, RegisterV8References(_));
+  local_tracer.RegisterWrappersWithRemoteTracer();
   EXPECT_CALL(remote_tracer, AdvanceTracing(0, _)).WillOnce(Return(true));
   EXPECT_TRUE(local_tracer.Trace(
       0, EmbedderHeapTracer::AdvanceTracingActions(
              EmbedderHeapTracer::ForceCompletionAction::FORCE_COMPLETION)));
   EXPECT_EQ(0u, local_tracer.NumberOfCachedWrappersToTrace());
 }
 
 }  // namespace heap
 }  // namespace internal
 }  // namespace v8