Add caps overrides to GMs

include/gpu/GrCaps.h

Index: include/gpu/GrCaps.h
diff --git a/include/gpu/GrCaps.h b/include/gpu/GrCaps.h
index be62d8a851972a8cd1182852e34a430696264a46..4eb2a56ce43648add2f5dbdbb7957c5e57c11791 100644
--- a/include/gpu/GrCaps.h
+++ b/include/gpu/GrCaps.h
@@ -194,6 +194,11 @@ public:
         return fDrawPathMasksToCompressedTextureSupport; }
 
 protected:
+    /** Subclasses must call this at the end of their constructors in order to apply caps
+        overrides requested by the client. Note that overrides will only reduce the caps never
+        expand them. */
+    void applyOptionsOverrides(const GrContextOptions& options);
+
     SkAutoTUnref<GrShaderCaps>    fShaderCaps;
 
     bool fNPOTTextureTileSupport        : 1;