Refactor libplatform unit tests to use GTest/GMock.

test/cctest/test-libplatform-worker-thread.cc

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-
-#include "src/v8.h"
-
-#include "src/libplatform/task-queue.h"
-#include "src/libplatform/worker-thread.h"
-#include "test/cctest/cctest.h"
-#include "test/cctest/test-libplatform.h"
-
-using namespace v8::internal;
-using namespace v8::platform;
-
-
-TEST(WorkerThread) {
-  TaskQueue queue;
-  TaskCounter task_counter;
-
-  TestTask* task1 = new TestTask(&task_counter, true);
-  TestTask* task2 = new TestTask(&task_counter, true);
-  TestTask* task3 = new TestTask(&task_counter, true);
-  TestTask* task4 = new TestTask(&task_counter, true);
-
-  WorkerThread* thread1 = new WorkerThread(&queue);
-  WorkerThread* thread2 = new WorkerThread(&queue);
-
-  CHECK_EQ(4, task_counter.GetCount());
-
-  queue.Append(task1);
-  queue.Append(task2);
-  queue.Append(task3);
-  queue.Append(task4);
-
-  // TaskQueue DCHECKs that it is empty in its destructor.
-  queue.Terminate();
-
-  delete thread1;
-  delete thread2;
-
-  CHECK_EQ(0, task_counter.GetCount());
-}