add scaledimagecache

include/core/SkGraphics.h

Index: include/core/SkGraphics.h
diff --git a/include/core/SkGraphics.h b/include/core/SkGraphics.h
index 87d66ad1f029a17d39f6ee7a3b1bfb77ecff36c3..c87604259077e82486f793d79d1ed66f093d7739 100644
--- a/include/core/SkGraphics.h
+++ b/include/core/SkGraphics.h
@@ -60,6 +60,10 @@ public:
      */
     static void PurgeFontCache();
 
+    static size_t GetImageCacheBytesUsed();
+    static size_t GetImageCacheByteLimit();
+    static size_t SetImageCacheByteLimit(size_t newLimit);
+
     /**
      *  Applications with command line options may pass optional state, such
      *  as cache sizes, here, for instance: