Don't require -DSK_USE_POSIX_THREADS.

src/utils/SkCondVar.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCondVar_DEFINED
 #define SkCondVar_DEFINED
 
 #include "SkTypes.h"
 
-#ifdef SK_USE_POSIX_THREADS
-    #include <pthread.h>
-#elif defined(SK_BUILD_FOR_WIN32)
+#ifdef SK_BUILD_FOR_WIN32
     #include <windows.h>
 #else
-    #error "SkCondVar requires pthreads or Windows."
+    #include <pthread.h>
 #endif
 
 /**
  * Condition variable for blocking access to shared data from other threads and
  * controlling which threads are awake.
  *
  * Currently only supported on platforms with posix threads and Windows Vista and above.
  */
 class SkCondVar {
 public:
@@ skipping 28 matching lines @@
      */
     void signal();
 
     /**
      * Wake all threads waiting on this condition. Must be called while lock()
      * is held.
      */
     void broadcast();
 
 private:
-#ifdef SK_USE_POSIX_THREADS
+#ifdef SK_BUILD_FOR_WIN32
+    CRITICAL_SECTION   fCriticalSection;
+    CONDITION_VARIABLE fCondition;
+#else
     pthread_mutex_t  fMutex;
     pthread_cond_t   fCond;
-#elif defined(SK_BUILD_FOR_WIN32)
-    CRITICAL_SECTION   fCriticalSection;
-    CONDITION_VARIABLE fCondition;
 #endif
 };
 
 #endif