Handle rrects with one circular corner and three square corners in GrRRectEffect.

gm/rrects.cpp

Index: gm/rrects.cpp
diff --git a/gm/rrects.cpp b/gm/rrects.cpp
index cc76718b0a5f114c98a2b2a7bbc18f1910ffe74b..a79ff5462f67d71fe817c864c7eb2d1bae333a6a 100644
--- a/gm/rrects.cpp
+++ b/gm/rrects.cpp
@@ -189,7 +189,7 @@ private:
     static const int kTileY = 40;
 
     static const int kNumSimpleCases = 7;
-    static const int kNumComplexCases = 23;
+    static const int kNumComplexCases = 27;
     static const SkVector gRadii[kNumComplexCases][4];
 
     static const int kNumRRects = kNumSimpleCases + kNumComplexCases;
@@ -238,6 +238,12 @@ const SkVector RRectGM::gRadii[kNumComplexCases][4] = {
     { { 20, 20 }, { 20, 20 }, { 0, 0 }, { 0, 0 } },
     { { 0, 0 }, { 0, 0 }, { 20, 20 }, { 20, 20 } },
     { { 20, 20 }, { 0, 0 }, { 0, 0 }, { 20, 20 } },
+
+    // single circular corner cases
+    { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 15, 15 } },
+    { { 0, 0 }, { 0, 0 }, { 15, 15 }, { 0, 0 } },
+    { { 0, 0 }, { 15, 15 }, { 0, 0 }, { 0, 0 } },
+    { { 15, 15 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
 };
 
 ///////////////////////////////////////////////////////////////////////////////