Revert of Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate.

src/gpu/gl/GrGLNoOpInterface.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLNoOpInterface.h"
-#include "SkMutex.h"
 #include "SkString.h"
+#include "SkThread.h"
 
 // the OpenGLES 2.0 spec says this must be >= 128
 static const GrGLint kDefaultMaxVertexUniformVectors = 128;
 
 // the OpenGLES 2.0 spec says this must be >=16
 static const GrGLint kDefaultMaxFragmentUniformVectors = 16;
 
 // the OpenGLES 2.0 spec says this must be >= 8
 static const GrGLint kDefaultMaxVertexAttribs = 8;
 
@@ skipping 652 matching lines @@
     static int gUniLocation = 0;
     return ++gUniLocation;
 }
 
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLInsertEventMarker(GrGLsizei length, const char* marker) {
 }
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLPushGroupMarker(GrGLsizei length  , const char* marker) {
 }
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLPopGroupMarker() {
 }