Make the Isolate parameter mandatory in Locker and Unlocker classes.

test/cctest/test-threads.cc

Index: test/cctest/test-threads.cc
diff --git a/test/cctest/test-threads.cc b/test/cctest/test-threads.cc
index 713d1e842509f919781322e0b09cf8c8e727ecac..ffb29cdd25feb8f338c496f20b07c972df26ac56 100644
--- a/test/cctest/test-threads.cc
+++ b/test/cctest/test-threads.cc
@@ -34,7 +34,7 @@
 
 
 TEST(Preemption) {
-  v8::Locker locker;
+  v8::Locker locker(CcTest::default_isolate());
   v8::V8::Initialize();
   v8::HandleScope scope;
   v8::Context::Scope context_scope(v8::Context::New());
@@ -67,7 +67,7 @@ class ThreadA : public v8::internal::Thread {
  public:
   ThreadA() : Thread("ThreadA") { }
   void Run() {
-    v8::Locker locker;
+    v8::Locker locker(CcTest::default_isolate());
     v8::HandleScope scope;
     v8::Context::Scope context_scope(v8::Context::New());
 
@@ -86,7 +86,7 @@ class ThreadA : public v8::internal::Thread {
     turn = CLEAN_CACHE;
     do {
       {
-        v8::Unlocker unlocker;
+        v8::Unlocker unlocker(CcTest::default_isolate());
         Thread::YieldCPU();
       }
     } while (turn != SECOND_TIME_FILL_CACHE);
@@ -105,7 +105,7 @@ class ThreadB : public v8::internal::Thread {
   void Run() {
     do {
       {
-        v8::Locker locker;
+        v8::Locker locker(CcTest::default_isolate());
         if (turn == CLEAN_CACHE) {
           v8::HandleScope scope;
           v8::Context::Scope context_scope(v8::Context::New());