Fix filter primitive bounds computations.

tests/ImageFilterTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkBitmapDevice.h"
 #include "SkBlurImageFilter.h"
@@ skipping 1134 matching lines @@
 DEF_TEST(ComposedImageFilterOffset, reporter) {
     SkBitmap bitmap;
     bitmap.allocN32Pixels(100, 100);
     bitmap.eraseARGB(0, 0, 0, 0);
     const SkSurfaceProps props(SkSurfaceProps::kLegacyFontHost_InitType);
     SkBitmapDevice device(bitmap, props);
     SkImageFilter::DeviceProxy proxy(&device);
 
     SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(1, 0, 20, 20));
     SkAutoTUnref<SkImageFilter> offsetFilter(SkOffsetImageFilter::Create(0, 0, nullptr, &cropRect));
-    SkAutoTUnref<SkImageFilter> blurFilter(makeBlur());
+    SkAutoTUnref<SkImageFilter> blurFilter(SkBlurImageFilter::Create(SK_Scalar1, SK_Scalar1, nullptr, &cropRect));
     SkAutoTUnref<SkImageFilter> composedFilter(SkComposeImageFilter::Create(blurFilter, offsetFilter.get()));
     SkBitmap result;
     SkIPoint offset;
     SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeWH(100, 100), nullptr, SkImageFilter::kApprox_SizeConstraint);
     REPORTER_ASSERT(reporter, composedFilter->filterImage(&proxy, bitmap, ctx, &result, &offset));
     REPORTER_ASSERT(reporter, offset.fX == 1 && offset.fY == 0);
 }
 
 DEF_TEST(PartialCropRect, reporter) {
     SkBitmap bitmap;
@@ skipping 144 matching lines @@
                                                          SkSurface::kNo_Budgeted,
                                                          SkImageInfo::MakeN32Premul(1, 1),
                                                          0,
                                                          &props,
                                                          SkGpuDevice::kUninit_InitContents));
     SkImageFilter::DeviceProxy proxy(device);
 
     test_negative_blur_sigma(&proxy, reporter);
 }
 #endif