Some small cleanups for image filter code.

tests/ImageFilterTest.cpp

Index: tests/ImageFilterTest.cpp
diff --git a/tests/ImageFilterTest.cpp b/tests/ImageFilterTest.cpp
index 91b2c09b2bd51df213a2f716f69448a17cd5e677..613ec302c91f96e422b8e19e2bcc473e88fe7a10 100644
--- a/tests/ImageFilterTest.cpp
+++ b/tests/ImageFilterTest.cpp
@@ -300,6 +300,9 @@ DEF_TEST(ImageFilterDrawTiled, reporter) {
     SkScalar gain = SK_Scalar1, bias = 0;
 
     SkAutoTUnref<SkImageFilter> gradient_source(SkBitmapSource::Create(make_gradient_circle(64, 64)));
+    SkMatrix matrix;
+    matrix.setTranslate(SK_Scalar1, SK_Scalar1);
+    matrix.postRotate(SkIntToScalar(45), SK_Scalar1, SK_Scalar1);
 
     struct {
         const char*    fName;
@@ -327,6 +330,7 @@ DEF_TEST(ImageFilterDrawTiled, reporter) {
         { "erode", SkErodeImageFilter::Create(2, 3) },
         { "tile", SkTileImageFilter::Create(SkRect::MakeXYWH(0, 0, 50, 50),
                                             SkRect::MakeXYWH(0, 0, 100, 100), NULL) },
+        { "matrix", SkMatrixImageFilter::Create(matrix, SkPaint::kLow_FilterLevel) },
     };
 
     SkBitmap untiledResult, tiledResult;