Initial design for background compilation

runtime/vm/gc_marker.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/gc_marker.h"
 
 #include <map>
 #include <utility>
 #include <vector>
 
@@ skipping 577 matching lines @@
         visit_prologue_weak_persistent_handles_(
             visit_prologue_weak_persistent_handles) {
   }
 
   virtual void Run() {
     Thread::EnterIsolateAsHelper(isolate_, true);
     {
       StackZone stack_zone(Thread::Current());
       Zone* zone = stack_zone.GetZone();
       SkippedCodeFunctions* skipped_code_functions =
-        collect_code_ ? new(zone) SkippedCodeFunctions() : NULL;
+          collect_code_ ? new(zone) SkippedCodeFunctions() : NULL;
       MarkingVisitor visitor(isolate_, heap_, page_space_, marking_stack_,
                              delay_set_, skipped_code_functions);
       // Phase 1: Populate and drain marking stack in task.
       // TODO(koda): Split root iteration work among multiple tasks.
       marker_->IterateRoots(isolate_, &visitor,
                             visit_prologue_weak_persistent_handles_);
       visitor.DrainMarkingStack();
       barrier_->Sync();
       // Phase 2: Weak processing and follow-up marking on main thread.
       barrier_->Sync();
@@ skipping 99 matching lines @@
       barrier.Exit();
     }
     delay_set.ClearReferences();
     ProcessWeakTables(page_space);
     ProcessObjectIdTable(isolate);
   }
   Epilogue(isolate, invoke_api_callbacks);
 }
 
 }  // namespace dart