Add some Mojo C thunks used by cc when turning on impl-side painting.

mojo/public/platform/native/gles2_impl_chromium_copy_texture_thunks.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.
+
+#ifndef MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_CHROMIUM_COPY_TEXTURE_THUNKS_H_
+#define MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_CHROMIUM_COPY_TEXTURE_THUNKS_H_
+
+#include <stddef.h>
+
+#include "mojo/public/c/gles2/chromium_copy_texture.h"
+
+// Specifies the frozen API for the GLES2 CHROMIUM_copy_texture extension.
+#pragma pack(push, 8)
+struct MojoGLES2ImplChromiumCopyTextureThunks {
+  size_t size;  // Should be set to sizeof(*this).
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType(*Function) PARAMETERS;
+#include "mojo/public/c/gles2/gles2_call_visitor_chromium_copy_texture_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 MojoGLES2ImplChromiumCopyTextureThunks
+MojoMakeGLES2ImplChromiumCopyTextureThunks() {
+  MojoGLES2ImplChromiumCopyTextureThunks gles2_impl_chromium_copy_texture_thunks = {
+      sizeof(MojoGLES2ImplChromiumCopyTextureThunks),
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) gl##Function,
+#include "mojo/public/c/gles2/gles2_call_visitor_chromium_copy_texture_autogen.h"
+#undef VISIT_GL_CALL
+  };
+
+  return gles2_impl_chromium_copy_texture_thunks;
+}
+
+// Use this type for the function found by dynamically discovering it in
+// a DSO linked with mojo_system.
+// The contents of |gles2_impl_chromium_copy_texture_thunks| are copied.
+typedef size_t (*MojoSetGLES2ImplChromiumCopyTextureThunksFn)(
+    const MojoGLES2ImplChromiumCopyTextureThunks* thunks);
+
+#endif  // MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_CHROMIUM_COPY_TEXTURE_THUNKS_H_