Optimize CSS box-shadow performance

src/core/SkBitmapCache.h

Index: src/core/SkBitmapCache.h
diff --git a/src/core/SkBitmapCache.h b/src/core/SkBitmapCache.h
index aec7a7d41cb6fd906e2eb2a458460bd5f6152701..7aaae3201785aa9294d617e8ac72cc3645acb800 100644
--- a/src/core/SkBitmapCache.h
+++ b/src/core/SkBitmapCache.h
@@ -8,6 +8,8 @@
 #ifndef SkBitmapCache_DEFINED
 #define SkBitmapCache_DEFINED
 
+#include "SkRect.h"
+#include "SkRRect.h"
 #include "SkScalar.h"
 #include "SkBitmap.h"
 
@@ -44,6 +46,12 @@ public:
      * result must be marked isImmutable()
      */
     static bool Add(uint32_t genID, const SkIRect& subset, const SkBitmap& result);
+
+    static bool Find(SkScalar sigma, const SkRRect& rrect, SkBitmap* result);
+    static void Add(SkScalar sigma, const SkRRect& rrect, const SkBitmap& result);
+
+    static bool Find(SkScalar sigma, int32_t count, const SkRect rects[], SkBitmap* result);
+    static void Add(SkScalar sigma, int32_t count, const SkRect rects[], const SkBitmap& result);
 };
 
 class SkMipMapCache {