Fix CircleBatch::TestCreate to always use a legal matrix

src/gpu/GrOvalRenderer.cpp

Index: src/gpu/GrOvalRenderer.cpp
diff --git a/src/gpu/GrOvalRenderer.cpp b/src/gpu/GrOvalRenderer.cpp
index c17388dca342cd862a8a11e7aee8eb013dc97601..ff8790580cceb1b4c88fb161fa3f0f9d6a2d9af4 100644
--- a/src/gpu/GrOvalRenderer.cpp
+++ b/src/gpu/GrOvalRenderer.cpp
@@ -1918,7 +1918,14 @@ GrDrawBatch* GrOvalRenderer::CreateArcBatch(GrColor color,
 
 DRAW_BATCH_TEST_DEFINE(CircleBatch) {
     do {
-        SkMatrix viewMatrix = GrTest::TestMatrix(random);
+        SkScalar rotate = random->nextSScalar1() * 360.f;
+        SkScalar translateX = random->nextSScalar1() * 1000.f;
+        SkScalar translateY = random->nextSScalar1() * 1000.f;
+        SkScalar scale = random->nextSScalar1() * 100.f;
+        SkMatrix viewMatrix;
+        viewMatrix.setRotate(rotate);
+        viewMatrix.postTranslate(translateX, translateY);
+        viewMatrix.postScale(scale, scale);
         GrColor color = GrRandomColor(random);
         SkRect circle = GrTest::TestSquare(random);
         SkPoint center = {circle.centerX(), circle.centerY()};