[heap] Add basic infrastructure for incremental wrapper tracing.

src/heap/incremental-marking.cc

 // Copyright 2012 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/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/gc-idle-time-handler.h"
@@ skipping 1183 matching lines @@
 
     bytes_scanned_ += bytes_to_process;
 
     // TODO(hpayer): Do not account for sweeping finalization while marking.
     if (state_ == SWEEPING) {
       FinalizeSweeping();
     }
 
     if (state_ == MARKING) {
       bytes_processed = ProcessMarkingDeque(bytes_to_process);
+      if (FLAG_incremental_marking_wrappers &&
+          heap_->UsingEmbedderHeapTracer()) {
+        // This currently marks through all registered wrappers and does not
+        // respect bytes_to_process.
+        // TODO(hpayer): Integrate incremental marking of wrappers into
+        // bytes_to_process logic.
+        heap_->mark_compact_collector()
+            ->RegisterWrappersWithEmbedderHeapTracer();
+        heap_->mark_compact_collector()->embedder_heap_tracer()->AdvanceTracing(
+            0,
+            EmbedderHeapTracer::AdvanceTracingActions(
+                EmbedderHeapTracer::ForceCompletionAction::FORCE_COMPLETION));
+      }
       if (heap_->mark_compact_collector()->marking_deque()->IsEmpty()) {
         if (completion == FORCE_COMPLETION ||
             IsIdleMarkingDelayCounterLimitReached()) {
           if (!finalize_marking_completed_) {
             FinalizeMarking(action);
           } else {
             MarkingComplete(action);
           }
         } else {
           IncrementIdleMarkingDelayCounter();
@@ skipping 44 matching lines @@
 void IncrementalMarking::IncrementIdleMarkingDelayCounter() {
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 }  // namespace internal
 }  // namespace v8