[turbofan] Enforce native context specialization.

test/unittests/test-utils.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_UNITTESTS_TEST_UTILS_H_
 #define V8_UNITTESTS_TEST_UTILS_H_
 
 #include "include/v8.h"
 #include "src/base/macros.h"
 #include "src/base/utils/random-number-generator.h"
@@ skipping 77 matching lines @@
   Factory* factory() const;
   Isolate* isolate() const {
     return reinterpret_cast<Isolate*>(::v8::TestWithIsolate::isolate());
   }
   base::RandomNumberGenerator* random_number_generator() const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestWithIsolate);
 };
 
-
 class TestWithZone : public virtual ::testing::Test {
  public:
   TestWithZone() : zone_(&allocator_) {}
   virtual ~TestWithZone();
 
   Zone* zone() { return &zone_; }
 
  private:
   v8::internal::AccountingAllocator allocator_;
   Zone zone_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWithZone);
 };
 
-
 class TestWithIsolateAndZone : public virtual TestWithIsolate {
  public:
   TestWithIsolateAndZone() : zone_(&allocator_) {}
   virtual ~TestWithIsolateAndZone();
 
   Zone* zone() { return &zone_; }
 
  private:
   v8::internal::AccountingAllocator allocator_;
   Zone zone_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWithIsolateAndZone);
 };
 
+class TestWithNativeContext : public virtual ::v8::TestWithContext,
+                              public virtual TestWithIsolate {
+ public:
+  TestWithNativeContext() {}
+  virtual ~TestWithNativeContext();
+
+  Handle<Context> native_context() const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestWithNativeContext);
+};
+
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UNITTESTS_TEST_UTILS_H_