Move platform abstraction to base library

src/counters.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_COUNTERS_H_
 #define V8_COUNTERS_H_
 
 #include "include/v8.h"
 #include "src/allocation.h"
+#include "src/base/platform/elapsed-timer.h"
 #include "src/globals.h"
 #include "src/objects.h"
-#include "src/platform/elapsed-timer.h"
 
 namespace v8 {
 namespace internal {
 
 // StatsCounters is an interface for plugging into external
 // counters for monitoring.  Counters can be looked up and
 // manipulated by name.
 
 class StatsTable {
  public:
@@ skipping 211 matching lines @@
   // Stop the timer and record the results.
   void Stop();
 
   // Returns true if the timer is running.
   bool Running() {
     return Enabled() && timer_.IsStarted();
   }
 
   // TODO(bmeurer): Remove this when HistogramTimerScope is fixed.
 #ifdef DEBUG
-  ElapsedTimer* timer() { return &timer_; }
+  base::ElapsedTimer* timer() { return &timer_; }
 #endif
 
  private:
-  ElapsedTimer timer_;
+  base::ElapsedTimer timer_;
 };
 
 // Helper class for scoping a HistogramTimer.
 // TODO(bmeurer): The ifdeffery is an ugly hack around the fact that the
 // Parser is currently reentrant (when it throws an error, we call back
 // into JavaScript and all bets are off), but ElapsedTimer is not
 // reentry-safe. Fix this properly and remove |allow_nesting|.
 class HistogramTimerScope BASE_EMBEDDED {
  public:
   explicit HistogramTimerScope(HistogramTimer* timer,
@@ skipping 421 matching lines @@
   friend class Isolate;
 
   explicit Counters(Isolate* isolate);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COUNTERS_H_