Add more strict DCHECKs around context state.

ui/gl/gl_context.cc

Index: ui/gl/gl_context.cc
diff --git a/ui/gl/gl_context.cc b/ui/gl/gl_context.cc
index 08a0c78b6e4825ed86b7c0f66f0c8ad6cb83d1b3..121b624e9bf2bf84d62d9d5a20fa663d5a665594 100644
--- a/ui/gl/gl_context.cc
+++ b/ui/gl/gl_context.cc
@@ -266,7 +266,6 @@ bool GLContext::MakeVirtuallyCurrent(
 
   DCHECK_EQ(this, GLContext::GetRealCurrent());
   DCHECK(IsCurrent(NULL));
-  DCHECK(virtual_context->IsCurrent(surface));
 
   if (switched_real_contexts || virtual_context != current_virtual_context_) {
 #if DCHECK_IS_ON()
@@ -301,6 +300,7 @@ bool GLContext::MakeVirtuallyCurrent(
     LOG(ERROR) << "Could not make GLSurface current.";
     return false;
   }
+  DCHECK(virtual_context->IsCurrent(surface));
   return true;
 }