add 90 degree test case to rects GM

https://codereview.chromium.org/13844017/



git-svn-id: http://skia.googlecode.com/svn/trunk@8911 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/rects.cpp b/gm/rects.cpp
index 2c972fb..3816f9e 100644
--- a/gm/rects.cpp
+++ b/gm/rects.cpp
@@ -159,6 +159,13 @@
             m.setRotate(SkIntToScalar(30));
             fMatrices.push_back(m);
         }
+
+        {
+            // 90 degree rotation
+            SkMatrix m;
+            m.setRotate(SkIntToScalar(90));
+            fMatrices.push_back(m);
+        }
     }
 
     void makeRects() {