Add an API to pump the message loop to libplatform

test/cctest/test-libplatform-default-platform.cc

+// 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.
+
+#include "src/v8.h"
+
+#include "src/libplatform/default-platform.h"
+#include "test/cctest/cctest.h"
+#include "test/cctest/test-libplatform.h"
+
+using namespace v8::internal;
+using namespace v8::platform;
+
+
+TEST(DefaultPlatformMessagePump) {
+  TaskCounter task_counter;
+
+  DefaultPlatform* platform = new DefaultPlatform();

[marja, 2014/07/03 09:26:35]

Nit: no need to allocate this on the heap really, you could just have
DefaultPlatform platform;, no?

+
+  TestTask* task = new TestTask(&task_counter, true);
+
+  CHECK(!platform->PumpMessageLoop(CcTest::isolate()));
+
+  platform->CallOnForegroundThread(CcTest::isolate(), task);
+
+  CHECK_EQ(1, task_counter.GetCount());
+  CHECK(platform->PumpMessageLoop(CcTest::isolate()));
+  CHECK_EQ(0, task_counter.GetCount());
+  CHECK(!platform->PumpMessageLoop(CcTest::isolate()));
+  delete platform;
+}