Allow explicit conversion operators and implement WTF::OwnPtr::operator bool.

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThread.cpp

 // Copyright 2015 The Chromium 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 "modules/compositorworker/CompositorWorkerThread.h"
 
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8Initializer.h"
 #include "core/workers/WorkerObjectProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
@@ skipping 99 matching lines @@
         MutexLocker lock(m_mutex);
         ASSERT(isMainThread() || m_thread->isCurrentThread());
         if (m_workerCount > 1)
             return;
 
         m_isolate->TerminateExecution();
     }
 
     bool hasThreadForTest()
     {
-        return m_thread;
+        return !!m_thread;
     }
 
     bool hasIsolateForTest()
     {
         return m_isolate;
     }
 
 private:
     CompositorWorkerSharedState() {}
     ~CompositorWorkerSharedState() {}
@@ skipping 79 matching lines @@
 {
     return CompositorWorkerSharedState::instance().hasThreadForTest();
 }
 
 bool CompositorWorkerThread::hasIsolateForTest()
 {
     return CompositorWorkerSharedState::instance().hasIsolateForTest();
 }
 
 } // namespace blink