gpu: Bind dummy GL API when no context is current

ui/gl/gl_context_cgl.cc

Index: ui/gl/gl_context_cgl.cc
diff --git a/ui/gl/gl_context_cgl.cc b/ui/gl/gl_context_cgl.cc
index 151c484d550f0d7b5f8062ffade0f670307d04a2..8caaf99ed496bfbdc9d8a573e8c2a79e12b70633 100644
--- a/ui/gl/gl_context_cgl.cc
+++ b/ui/gl/gl_context_cgl.cc
@@ -190,8 +190,9 @@ bool GLContextCGL::MakeCurrent(GLSurface* surface) {
   SetRealGLApi();
 
   SetCurrent(surface);
+  ScopedReleaseCurrent release_current(this, surface);
+
   if (!InitializeDynamicBindings()) {
-    ReleaseCurrent(surface);
     return false;
   }
 
@@ -200,6 +201,7 @@ bool GLContextCGL::MakeCurrent(GLSurface* surface) {
     return false;
   }
 
+  release_current.Release();
   return true;
 }