Optimize CSS box-shadow performance by caching the SkMask of the blur effect.

include/core/SkMask.h

Index: include/core/SkMask.h
diff --git a/include/core/SkMask.h b/include/core/SkMask.h
index 5cfef970c5024fd91bd2b2767c4fd93f33d9cf8d..d236ecdd899d06c9ea7eda88df24f142f3ca0dca 100644
--- a/include/core/SkMask.h
+++ b/include/core/SkMask.h
@@ -136,6 +136,12 @@ struct SkMask {
     };
 };
 
+struct SkDiscardableMemoryMask {

[Stephen White, 2014/06/09 18:03:57]

Naming nit: instead of baking "discardable memory" into the name, maybe this
could be something a bit more generic, like SkCachedMask?

+    SkMask fMask;
+    uint32_t fPixelGenerationID;
+    void*    fCacheId;
+};
+
 ///////////////////////////////////////////////////////////////////////////////
 
 /**