Add caps overrides to GMs

Review URL: https://codereview.chromium.org/1158963002
diff --git a/gm/textblobuseaftergpufree.cpp b/gm/textblobuseaftergpufree.cpp
index 127e436..070c9ef 100644
--- a/gm/textblobuseaftergpufree.cpp
+++ b/gm/textblobuseaftergpufree.cpp
@@ -12,6 +12,7 @@
 #include "SkCanvas.h"
 #include "SkSurface.h"
 #include "SkTextBlob.h"
+#include "GrContext.h"
 
 // This tests that we correctly regenerate textblobs after freeing all gpu resources crbug/491350
 namespace skiagm {