Turn on quilt mode in DM.

gm/gradients_2pt_conical.cpp

Index: gm/gradients_2pt_conical.cpp
diff --git a/gm/gradients_2pt_conical.cpp b/gm/gradients_2pt_conical.cpp
index 7f0467e53e54b067fa4357007d8574c7774dfa9e..dece66ed8b2aa6ab2c29f40a15da229ff92694d8 100644
--- a/gm/gradients_2pt_conical.cpp
+++ b/gm/gradients_2pt_conical.cpp
@@ -339,6 +339,13 @@ public:
     }
 
 protected:
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        if (fGradCaseType != kInside_GradCaseType) {
+            return kSkipTiled_Flag;
+        }
+        return 0;
+    }
+
     SkString onShortName() {
         return fName;
     }