Expose CHROMIUM_texture_mailbox/sync_point stubs in mojo public headers

mojo/public/platform/native/gles2_impl_chromium_sync_point_thunks.cc

Index: mojo/public/platform/native/gles2_impl_chromium_sync_point_thunks.cc
diff --git a/mojo/public/platform/native/gles2_impl_chromium_sync_point_thunks.cc b/mojo/public/platform/native/gles2_impl_chromium_sync_point_thunks.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0a47f335f73fcf46f87df3a9d6b8f31f13b6147a
--- /dev/null
+++ b/mojo/public/platform/native/gles2_impl_chromium_sync_point_thunks.cc
@@ -0,0 +1,32 @@
+// 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.
+
+#include "mojo/public/platform/native/gles2_impl_chromium_sync_point_thunks.h"
+
+#include <assert.h>
+
+#include "mojo/public/platform/native/thunk_export.h"
+
+extern "C" {
+static MojoGLES2ImplChromiumSyncPointThunks g_impl_chromium_sync_point_thunks =
+    {0};
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType gl##Function PARAMETERS {                             \
+    assert(g_impl_chromium_sync_point_thunks.Function);            \
+    return g_impl_chromium_sync_point_thunks.Function ARGUMENTS;   \
+  }
+#include "mojo/public/c/gles2/gles2_call_visitor_chromium_sync_point_autogen.h"
+#undef VISIT_GL_CALL
+
+extern "C" THUNK_EXPORT size_t MojoSetGLES2ImplChromiumSyncPointThunks(
+    const MojoGLES2ImplChromiumSyncPointThunks*
+        gles2_impl_chromium_sync_point_thunks) {
+  if (gles2_impl_chromium_sync_point_thunks->size >=
+      sizeof(g_impl_chromium_sync_point_thunks))
+    g_impl_chromium_sync_point_thunks = *gles2_impl_chromium_sync_point_thunks;
+  return sizeof(g_impl_chromium_sync_point_thunks);
+}
+
+}  // extern "C"