Make mutex semaphore based.

src/core/SkSharedMutex.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSharedMutex.h"
 
 #include "SkAtomics.h"
-#include "SkSemaphore.h"
 #include "SkTypes.h"
+#include "../private/SkSemaphore.h"
 
 #if defined(THREAD_SANITIZER)
 
 /* Report that a lock has been created at address "lock". */
 #define ANNOTATE_RWLOCK_CREATE(lock) \
     AnnotateRWLockCreate(__FILE__, __LINE__, lock)
 
 /* Report that the lock at address "lock" is about to be destroyed. */
 #define ANNOTATE_RWLOCK_DESTROY(lock) \
     AnnotateRWLockDestroy(__FILE__, __LINE__, lock)
@@ skipping 326 matching lines @@
 
         // If shared count is going to zero (because the old count == 1) and there are exclusive
         // waiters, then run a single exclusive waiter.
         if (((oldQueueCounts & kSharedMask) >> kSharedOffset) == 1
             && (oldQueueCounts & kWaitingExclusiveMask) > 0) {
             fExclusiveQueue.signal();
         }
     }
 
 #endif