Move mojo/public/c/gpu/* to mojo/public/c/include.

mojo/public/c/gpu/MGL/mgl_types.h

-// Copyright 2015 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.
-
-// Note: This header should be compilable as C.
-
-#ifndef MOJO_PUBLIC_C_GPU_MGL_TYPES_H_
-#define MOJO_PUBLIC_C_GPU_MGL_TYPES_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef struct MGLContextPrivate* MGLContext;
-typedef void (*MGLContextLostCallback)(void* closure);
-typedef void (*MGLSignalSyncPointCallback)(void* closure);
-
-// This is a generic function pointer type, which must be cast to the proper
-// type and calling convention before use.
-typedef void (*MGLMustCastToProperFunctionPointerType)(void);
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
-
-#endif  // MOJO_PUBLIC_C_GPU_MGL_TYPES_H_