Make unittests work in component build

src/heap/gc-idle-time-handler.h

 // Copyright 2014 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_GC_IDLE_TIME_HANDLER_H_
 #define V8_HEAP_GC_IDLE_TIME_HANDLER_H_
 
 #include "src/globals.h"
 
 namespace v8 {
@@ skipping 50 matching lines @@
 
   int contexts_disposed;
   double contexts_disposal_rate;
   size_t size_of_objects;
   bool incremental_marking_stopped;
 };
 
 
 // The idle time handler makes decisions about which garbage collection
 // operations are executing during IdleNotification.
-class GCIdleTimeHandler {
+class V8_EXPORT_PRIVATE GCIdleTimeHandler {
  public:
   // If we haven't recorded any incremental marking events yet, we carefully
   // mark with a conservative lower bound for the marking speed.
   static const size_t kInitialConservativeMarkingSpeed = 100 * KB;
 
   // Maximum marking step size returned by EstimateMarkingStepSize.
   static const size_t kMaximumMarkingStepSize = 700 * MB;
 
   // We have to make sure that we finish the IdleNotification before
   // idle_time_in_ms. Hence, we conservatively prune our workload estimate.
@@ skipping 66 matching lines @@
   // Idle notifications with no progress.
   int idle_times_which_made_no_progress_;
 
   DISALLOW_COPY_AND_ASSIGN(GCIdleTimeHandler);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_GC_IDLE_TIME_HANDLER_H_