Mozart: Avoid blocking in glCheckFramebufferStatus().

mojo/ui/gl_renderer.h

Index: mojo/ui/gl_renderer.h
diff --git a/mojo/ui/gl_renderer.h b/mojo/ui/gl_renderer.h
index 4682b3daba3a4dc19ae016e9f1959dadda4b19e8..baf09b92360fe19b8e81575b64769f1f5e0f1b83 100644
--- a/mojo/ui/gl_renderer.h
+++ b/mojo/ui/gl_renderer.h
@@ -9,6 +9,7 @@
 #include <memory>
 
 #include "base/callback.h"
+#include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ -103,6 +104,10 @@ class GLRenderer {
   std::deque<GLRecycledTextureInfo> recycled_textures_;
   uint32_t bound_textures_ = 0u;
 
+#if DCHECK_IS_ON()
+  bool checked_framebuffer_status_ = false;
+#endif
+
   base::WeakPtrFactory<mojo::ui::GLRenderer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GLRenderer);