gpu: Add calling convention for win32

gpu/gles2_conform_support/egl/egl.cc

 // Copyright (c) 2012 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 <EGL/egl.h>
 
 #include "base/command_line.h"
 #include "gpu/command_buffer/client/gles2_lib.h"
 #include "gpu/gles2_conform_support/egl/display.h"
 #include "ui/gl/gl_context.h"
@@ skipping 381 matching lines @@
 
 EGLBoolean eglCopyBuffers(EGLDisplay dpy,
                           EGLSurface surface,
                           EGLNativePixmapType target) {
   return EGL_FALSE;
 }
 
 /* Now, define eglGetProcAddress using the generic function ptr. type */
 __eglMustCastToProperFunctionPointerType
 eglGetProcAddress(const char* procname) {
-  return gles2::GetGLFunctionPointer(procname);
+  return (__eglMustCastToProperFunctionPointerType)gles2::GetGLFunctionPointer(

[piman, 2015/07/28 18:43:16]

nit: no c-style cast, use a static_cast (if possible) or reinterpret_cast.

+      procname);
 }
 }  // extern "C"