[platform] Implement a worker pool

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

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 #include "v8.h"
 
-#include "default-platform.h"
+#include "cctest.h"
+#include "libplatform/task-queue.h"
+#include "libplatform/worker-thread.h"
+#include "test-libplatform.h"
 
-namespace v8 {
-namespace internal {
+using namespace v8::internal;
 
 
-DefaultPlatform::DefaultPlatform() {}
+TEST(WorkerThread) {
+  TaskQueue queue;
 
+  TestTask* task1 = new TestTask(true);
+  TestTask* task2 = new TestTask(true);
+  TestTask* task3 = new TestTask(true);
+  TestTask* task4 = new TestTask(true);
 
-DefaultPlatform::~DefaultPlatform() {}
+  WorkerThread thread1(&queue);
+  WorkerThread thread2(&queue);
 
-void DefaultPlatform::CallOnBackgroundThread(Task *task,
-                                             ExpectedRuntime expected_runtime) {
-  // TODO(jochen): implement.
-  task->Run();
-  delete task;
+  thread1.Start();
+  thread2.Start();
+
+  queue.Append(task1);
+  queue.Append(task2);
+  queue.Append(task3);
+  queue.Append(task4);
+
+  // TaskQueue ASSERTs that it is empty in its dtor.
+  queue.Terminate();
+
+  thread1.Join();
+  thread2.Join();
 }
-
-
-void DefaultPlatform::CallOnForegroundThread(v8::Isolate* isolate, Task* task) {
-  // TODO(jochen): implement.
-  task->Run();
-  delete task;
-}
-
-
-} }  // namespace v8::internal