Change SkResourceCache to take a Visitor inside its find().

bench/ImageCacheBench.cpp

Index: bench/ImageCacheBench.cpp
diff --git a/bench/ImageCacheBench.cpp b/bench/ImageCacheBench.cpp
index ca2b9342d515ba3186a0a8b4670a69d836561c1a..0f8fdf27089916b0df25d0aa49a0f60078b3fd39 100644
--- a/bench/ImageCacheBench.cpp
+++ b/bench/ImageCacheBench.cpp
@@ -27,6 +27,10 @@ struct TestRec : public SkResourceCache::Rec {
 
     virtual const Key& getKey() const SK_OVERRIDE { return fKey; }
     virtual size_t bytesUsed() const SK_OVERRIDE { return sizeof(fKey) + sizeof(fValue); }
+
+    static bool Visitor(const SkResourceCache::Rec&, void*) {
+        return true;
+    }
 };
 }
 
@@ -41,7 +45,7 @@ public:
 
     void populateCache() {
         for (int i = 0; i < CACHE_COUNT; ++i) {
-            fCache.unlock(fCache.addAndLock(SkNEW_ARGS(TestRec, (TestKey(i), i))));
+            fCache.add(SkNEW_ARGS(TestRec, (TestKey(i), i)));
         }
     }
 
@@ -58,8 +62,8 @@ protected:
         TestKey key(-1);
         // search for a miss (-1)
         for (int i = 0; i < loops; ++i) {
-            SkDEBUGCODE(SkResourceCache::ID id =) fCache.findAndLock(key);
-            SkASSERT(NULL == id);
+            SkDEBUGCODE(bool found =) fCache.find(key, TestRec::Visitor, NULL);
+            SkASSERT(!found);
         }
     }