Minimal Changes to run tests on iOS

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index d51d9c8cd9436546e3b7a4f70d5e231889683c47..d4eaf65c5fac2ef6582b5ad15a3633e3e05c1e75 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -24,7 +24,11 @@
 #include "SkGr.h"
 #endif
 
-enum { kDefaultCacheSize = 128 * 1024 * 1024 };
+#ifdef SK_BUILD_FOR_IOS
+  enum { kDefaultCacheSize = 2 * 1024 * 1024 };
+#else 
+  enum { kDefaultCacheSize = 128 * 1024 * 1024 };
+#endif 
 
 static int32_t next_image_filter_unique_id() {
     static int32_t gImageFilterUniqueID;