Add size change notifications to GrResourceCache

include/gpu/GrCacheable.h

Index: include/gpu/GrCacheable.h
diff --git a/include/gpu/GrCacheable.h b/include/gpu/GrCacheable.h
index 75dec16033f9b2b6dcf86938c54346ce4e7d51df..39c62b1b66c730ba130303c7bafb2b9733af7ce6 100644
--- a/include/gpu/GrCacheable.h
+++ b/include/gpu/GrCacheable.h
@@ -46,6 +46,14 @@ protected:
 
     bool isInCache() const { return NULL != fCacheEntry; }
 
+    /**
+     * This entry point should be called whenever gpuMemorySize() begins
+     * reporting a different size. If the object is in the cache, it will call
+     * gpuMemorySize() immediately and pass the new size on to the resource
+     * cache.
+     */
+    void didChangeGpuMemorySize() const;
+
 private:
     GrResourceCacheEntry* fCacheEntry;  // NULL if not in cache