Add support for GL_EXT_debug_marker.

mojo/public/platform/native/gles2_impl_ext_debug_marker_thunks.cc

Index: mojo/public/platform/native/gles2_impl_ext_debug_marker_thunks.cc
diff --git a/mojo/public/platform/native/gles2_impl_ext_debug_marker_thunks.cc b/mojo/public/platform/native/gles2_impl_ext_debug_marker_thunks.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5f1e742b048c8516b39c0447b08c25aef7bbdab2
--- /dev/null
+++ b/mojo/public/platform/native/gles2_impl_ext_debug_marker_thunks.cc
@@ -0,0 +1,33 @@
+// 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.
+
+#include "mojo/public/platform/native/gles2_impl_ext_debug_marker_thunks.h"
+
+#include <assert.h>
+
+#include "mojo/public/platform/native/thunk_export.h"
+
+extern "C" {
+
+static MojoGLES2ImplExtDebugMarkerThunks g_impl_ext_debug_marker_thunks = {0};
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType gl##Function PARAMETERS {                             \
+    assert(g_impl_ext_debug_marker_thunks.Function);               \
+    return g_impl_ext_debug_marker_thunks.Function ARGUMENTS;      \
+  }
+#include "mojo/public/c/gles2/gles2_call_visitor_ext_debug_marker_autogen.h"
+#undef VISIT_GL_CALL
+
+extern "C" THUNK_EXPORT size_t
+MojoSetGLES2ImplExtDebugMarkerThunks(const MojoGLES2ImplExtDebugMarkerThunks*
+                                         gles2_impl_ext_debug_marker_thunks) {
+  if (gles2_impl_ext_debug_marker_thunks->size >=
+      sizeof(g_impl_ext_debug_marker_thunks)) {
+    g_impl_ext_debug_marker_thunks = *gles2_impl_ext_debug_marker_thunks;
+  }
+  return sizeof(g_impl_ext_debug_marker_thunks);
+}
+
+}  // extern "C"