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..141d9352a42c56c756a4c367c3d499b9922db4f4 100644
--- a/ui/gl/gl_context_cgl.cc
+++ b/ui/gl/gl_context_cgl.cc
@@ -178,6 +178,7 @@ bool GLContextCGL::MakeCurrent(GLSurface* surface) {
   if (IsCurrent(surface))
     return true;
 
+  ScopedReleaseCurrent release_current;
   TRACE_EVENT0("gpu", "GLContextCGL::MakeCurrent");
 
   if (CGLSetCurrentContext(
@@ -191,7 +192,6 @@ bool GLContextCGL::MakeCurrent(GLSurface* surface) {
 
   SetCurrent(surface);
   if (!InitializeDynamicBindings()) {
-    ReleaseCurrent(surface);
     return false;
   }
 
@@ -200,6 +200,7 @@ bool GLContextCGL::MakeCurrent(GLSurface* surface) {
     return false;
   }
 
+  release_current.Cancel();
   return true;
 }