[turbofan] Enforce native context specialization.

test/unittests/test-utils.h

Index: test/unittests/test-utils.h
diff --git a/test/unittests/test-utils.h b/test/unittests/test-utils.h
index 984d63ce2a14870ce579a0825ed44ef1349c89e6..d75c504ff96f5d6edadab9b37263715c6e33ca7e 100644
--- a/test/unittests/test-utils.h
+++ b/test/unittests/test-utils.h
@@ -95,7 +95,6 @@ class TestWithIsolate : public virtual ::v8::TestWithIsolate {
   DISALLOW_COPY_AND_ASSIGN(TestWithIsolate);
 };
 
-
 class TestWithZone : public virtual ::testing::Test {
  public:
   TestWithZone() : zone_(&allocator_) {}
@@ -110,7 +109,6 @@ class TestWithZone : public virtual ::testing::Test {
   DISALLOW_COPY_AND_ASSIGN(TestWithZone);
 };
 
-
 class TestWithIsolateAndZone : public virtual TestWithIsolate {
  public:
   TestWithIsolateAndZone() : zone_(&allocator_) {}
@@ -125,6 +123,18 @@ class TestWithIsolateAndZone : public virtual TestWithIsolate {
   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