Swap over to using SkImageFilter::filterImage instead of filterImageDeprecated

tests/TestingSpecialImageAccess.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file
+ */
+
+#ifndef TestingSpecialImageAccess_DEFINED
+#define TestingSpecialImageAccess_DEFINED
+
+class TestingSpecialImageAccess {
+public:
+    static const SkIRect& Subset(const SkSpecialImage* img) {
+        return img->subset();
+    }
+
+    static bool PeekPixels(const SkSpecialImage* img, SkPixmap* pixmap) {
+        return img->testingOnlyPeekPixels(pixmap);
+    }
+
+    static GrTexture* PeekTexture(const SkSpecialImage* img) {
+        return img->peekTexture();
+    }
+
+    static bool GetROPixels(const SkSpecialImage* img, SkBitmap* result) {
+        return img->testingOnlyGetROPixels(result);
+    }
+};
+
+#endif