Use TestDiscardableMemoryAllocator in filter_fuzz_stub.

skia/tools/filter_fuzz_stub/filter_fuzz_stub.cc

Index: skia/tools/filter_fuzz_stub/filter_fuzz_stub.cc
diff --git a/skia/tools/filter_fuzz_stub/filter_fuzz_stub.cc b/skia/tools/filter_fuzz_stub/filter_fuzz_stub.cc
index 4d5ec61ae156f27327604816ecdd66c5e3856a12..b96d9d3adc2677e58a1b7a292c115aa43355528b 100644
--- a/skia/tools/filter_fuzz_stub/filter_fuzz_stub.cc
+++ b/skia/tools/filter_fuzz_stub/filter_fuzz_stub.cc
@@ -4,6 +4,7 @@
 
 #include "base/files/file_util.h"
 #include "base/logging.h"
+#include "base/test/test_discardable_memory_allocator.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkFlattenableSerialization.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
@@ -72,6 +73,9 @@ bool ReadAndRunTestCase(const char* filename, SkBitmap& bitmap,
 int main(int argc, char** argv) {
   int ret = 0;
 
+  base::TestDiscardableMemoryAllocator discardable_memory_allocator;
+  base::DiscardableMemoryAllocator::SetInstance(&discardable_memory_allocator);
+
   SkBitmap bitmap;
   bitmap.allocN32Pixels(BitmapSize, BitmapSize);
   SkCanvas canvas(bitmap);