Expose CHROMIUM_texture_mailbox/sync_point stubs in mojo public headers

mojo/public/platform/native/gles2_impl_thunks.h

Index: mojo/public/platform/native/gles2_impl_thunks.h
diff --git a/mojo/public/platform/native/gles2_impl_thunks.h b/mojo/public/platform/native/gles2_impl_thunks.h
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+++ b/mojo/public/platform/native/gles2_impl_thunks.h
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+// Copyright 2014 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.
+
+#ifndef MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_THUNKS_H_
+#define MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_THUNKS_H_
+
+#include <stddef.h>
+
+#include "mojo/public/c/gles2/gles2.h"
+
+// Like MojoGLES2ControlThunks, but specifies the frozen GLES2 API. Separated
+// out as MojoGLES2ControlThunks may be modified and added to, but this
+// interface is frozen.
+#pragma pack(push, 8)
+struct MojoGLES2ImplThunks {
+  size_t size;  // Should be set to sizeof(MojoGLES2ImplThunks).
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType(*Function) PARAMETERS;
+#include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
+#undef VISIT_GL_CALL
+};
+#pragma pack(pop)
+
+// Intended to be called from the embedder to get the embedder's implementation
+// of GLES2.
+inline MojoGLES2ImplThunks MojoMakeGLES2ImplThunks() {
+  MojoGLES2ImplThunks gles2_impl_thunks = {
+      sizeof(MojoGLES2ImplThunks),
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) gl##Function,
+#include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
+#undef VISIT_GL_CALL
+  };
+
+  return gles2_impl_thunks;
+}
+
+// Use this type for the function found by dynamically discovering it in
+// a DSO linked with mojo_system. For example:
+// MojoSetGLES2ImplThunksFn mojo_set_gles2_impl_thunks_fn =
+//     reinterpret_cast<MojoSetGLES2ImplThunksFn>(
+//         app_library.GetFunctionPointer("MojoSetGLES2ImplThunks"));
+// The expected size of |gles2_impl_thunks| is returned.
+// The contents of |gles2_impl_thunks| are copied.
+typedef size_t (*MojoSetGLES2ImplThunksFn)(
+    const MojoGLES2ImplThunks* gles2_impl_thunks);
+
+#endif  // MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_THUNKS_H_