Move platform abstraction to base library

src/heap.h

 // 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.
 
 #ifndef V8_HEAP_H_
 #define V8_HEAP_H_
 
 #include <cmath>
 
 #include "src/allocation.h"
@@ skipping 2128 matching lines @@
   // Flag is set when the heap has been configured.  The heap can be repeatedly
   // configured through the API until it is set up.
   bool configured_;
 
   ExternalStringTable external_string_table_;
 
   VisitorDispatchTable<ScavengingCallback> scavenging_visitors_table_;
 
   MemoryChunk* chunks_queued_for_free_;
 
-  Mutex relocation_mutex_;
+  base::Mutex relocation_mutex_;
 
   int gc_callbacks_depth_;
 
   friend class AlwaysAllocateScope;
   friend class Factory;
   friend class GCCallbacksScope;
   friend class GCTracer;
   friend class HeapIterator;
   friend class Isolate;
   friend class MarkCompactCollector;
@@ skipping 359 matching lines @@
       MC_UPDATE_MISC_POINTERS,
       MC_WEAKCOLLECTION_PROCESS,
       MC_WEAKCOLLECTION_CLEAR,
       MC_FLUSH_CODE,
       kNumberOfScopes
     };
 
     Scope(GCTracer* tracer, ScopeId scope)
         : tracer_(tracer),
         scope_(scope) {
-      start_time_ = OS::TimeCurrentMillis();
+      start_time_ = base::OS::TimeCurrentMillis();
     }
 
     ~Scope() {
       ASSERT(scope_ < kNumberOfScopes);  // scope_ is unsigned.
-      tracer_->scopes_[scope_] += OS::TimeCurrentMillis() - start_time_;
+      tracer_->scopes_[scope_] += base::OS::TimeCurrentMillis() - start_time_;
     }
 
    private:
     GCTracer* tracer_;
     ScopeId scope_;
     double start_time_;
   };
 
   explicit GCTracer(Heap* heap,
                     const char* gc_reason,
@@ skipping 220 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_