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 ebade0ebd9b67fa277d6e9b2407cd2e691f20676..6b9f0881f1c741dcc2383c995877648c0f6eb1ae 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 "SkScaledImageCache.h"
 
 class SkBitmapCache {
@@ -28,6 +30,16 @@ public:
     static ID* FindAndLock(uint32_t genID, int width, int height, SkBitmap* result);
 
     static ID* AddAndLock(uint32_t genID, int width, int height, const SkBitmap& result);
+
+    /* Input: blur_sigma+rrect */
+    static ID* FindAndLock(SkScalar sigma, const SkRRect rrect, SkBitmap* result);
+    static ID* AddAndLock(SkScalar sigma, const SkRRect rrect, const SkBitmap& bitmap);
+
+    /* Input: blur_sigma+rects_count+rects */
+    static ID* FindAndLock(SkScalar sigma, unsigned count, const SkRect rects[],
+                           SkBitmap* result);
+    static ID* AddAndLock(SkScalar sigma, unsigned count, const SkRect rects[],
+                          const SkBitmap& bitmap);
 };
 
 class SkMipMapCache {