Use void* again for PlatformFence

tools/gpu/gl/GLTestContext.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 "GLTestContext.h"
 #include "gl/GrGLUtil.h"
 
@@ skipping 10 matching lines @@
 private:
     GLFenceSync(const sk_gpu_test::GLTestContext*, const char* ext = "");
 
     bool validate() { return fGLFenceSync && fGLClientWaitSync && fGLDeleteSync; }
 
     static constexpr GrGLenum GL_SYNC_GPU_COMMANDS_COMPLETE  = 0x9117;
     static constexpr GrGLenum GL_WAIT_FAILED                 = 0x911d;
     static constexpr GrGLbitfield GL_SYNC_FLUSH_COMMANDS_BIT = 0x00000001;
 
     typedef struct __GLsync *GLsync;
+    GR_STATIC_ASSERT(sizeof(GLsync) <= sizeof(sk_gpu_test::PlatformFence));
 
     typedef GLsync (GR_GL_FUNCTION_TYPE* GLFenceSyncProc) (GrGLenum, GrGLbitfield);
     typedef GrGLenum (GR_GL_FUNCTION_TYPE* GLClientWaitSyncProc) (GLsync, GrGLbitfield, GrGLuint64);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GLDeleteSyncProc) (GLsync);
 
     GLFenceSyncProc        fGLFenceSync;
     GLClientWaitSyncProc   fGLClientWaitSync;
     GLDeleteSyncProc       fGLDeleteSync;
 
     typedef FenceSync INHERITED;
@@ skipping 97 matching lines @@
                                   GR_GL_NEAREST));
     GR_GL_CALL(fGL, TexParameteri(GR_GL_TEXTURE_RECTANGLE, GR_GL_TEXTURE_WRAP_S,
                                   GR_GL_CLAMP_TO_EDGE));    
     GR_GL_CALL(fGL, TexParameteri(GR_GL_TEXTURE_RECTANGLE, GR_GL_TEXTURE_WRAP_T,
                                   GR_GL_CLAMP_TO_EDGE));
     GR_GL_CALL(fGL, TexImage2D(GR_GL_TEXTURE_RECTANGLE, 0, internalFormat, width, height, 0,
                                externalFormat, externalType, data));
     return id;
 }
 }  // namespace sk_gpu_test