Expose CHROMIUM_texture_mailbox/sync_point stubs in mojo public headers

mojo/gles2/gles2_impl.cc

Index: mojo/gles2/gles2_impl.cc
diff --git a/mojo/gles2/gles2_impl.cc b/mojo/gles2/gles2_impl.cc
index 59b427846589649b4cc59b963646a7abc99da2c4..2ff868a97ba8734c27fcf4c84cccb02db071237e 100644
--- a/mojo/gles2/gles2_impl.cc
+++ b/mojo/gles2/gles2_impl.cc
@@ -6,6 +6,7 @@
 
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "mojo/gles2/gles2_context.h"
+#include "mojo/gles2/gles2_impl_export.h"
 
 using mojo::gles2::GLES2Context;
 
@@ -71,12 +72,14 @@ void* MojoGLES2GetContextSupport(MojoGLES2Context context) {
   return static_cast<GLES2Context*>(context)->context_support();
 }
 
-#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS)  \
-  ReturnType gl##Function PARAMETERS {                              \
-    assert(g_gpu_interface);                                        \
-    return g_gpu_interface->Function ARGUMENTS;                     \
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  MOJO_GLES2_IMPL_EXPORT ReturnType gl##Function PARAMETERS {      \
+    assert(g_gpu_interface);                                       \
+    return g_gpu_interface->Function ARGUMENTS;                    \
   }
 #include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
+#include "mojo/public/c/gles2/gles2_call_visitor_chromium_sync_point_autogen.h"
+#include "mojo/public/c/gles2/gles2_call_visitor_chromium_texture_mailbox_autogen.h"
 #undef VISIT_GL_CALL
 
 }  // extern "C"