increase resource image-cache size to test perf

BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/1332393002
diff --git a/src/core/SkResourceCache.cpp b/src/core/SkResourceCache.cpp
index 46229fa..54091f1 100644
--- a/src/core/SkResourceCache.cpp
+++ b/src/core/SkResourceCache.cpp
@@ -26,7 +26,7 @@
 #endif
 
 #ifndef SK_DEFAULT_IMAGE_CACHE_LIMIT
-    #define SK_DEFAULT_IMAGE_CACHE_LIMIT     (2 * 1024 * 1024)
+    #define SK_DEFAULT_IMAGE_CACHE_LIMIT     (32 * 1024 * 1024)
 #endif
 
 void SkResourceCache::Key::init(void* nameSpace, uint64_t sharedID, size_t length) {