Reland "[heap] Ensure progress when incrementally marking wrappers"

src/heap/embedder-tracing.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 "src/base/logging.h"
 
 namespace v8 {
 namespace internal {
 
 void LocalEmbedderHeapTracer::TracePrologue() {
   if (!InUse()) return;
 
   CHECK(cached_wrappers_to_trace_.empty());
+  num_v8_marking_deque_was_empty_ = 0;
   remote_tracer_->TracePrologue();
 }
 
 void LocalEmbedderHeapTracer::TraceEpilogue() {
   if (!InUse()) return;
 
   CHECK(cached_wrappers_to_trace_.empty());
   remote_tracer_->TraceEpilogue();
 }
 
@@ skipping 36 matching lines @@
   cached_wrappers_to_trace_.clear();
 }
 
 bool LocalEmbedderHeapTracer::RequiresImmediateWrapperProcessing() {
   const size_t kTooManyWrappers = 16000;
   return cached_wrappers_to_trace_.size() > kTooManyWrappers;
 }
 
 }  // namespace internal
 }  // namespace v8