private iterator to visit all resource cache entries

src/core/SkResourceCache.h

Index: src/core/SkResourceCache.h
diff --git a/src/core/SkResourceCache.h b/src/core/SkResourceCache.h
index b43572f4bef3d14131c5cb69ee9f3db927652f02..72c574108389af9cdf13ae275d604d16a210a866 100644
--- a/src/core/SkResourceCache.h
+++ b/src/core/SkResourceCache.h
@@ -14,7 +14,6 @@
 
 class SkCachedData;
 class SkDiscardableMemory;
-class SkMipMap;
 
 /**
  *  Cache object for bitmaps (with possible scale in X Y as part of the key).
@@ -78,6 +77,10 @@ public:
         virtual const Key& getKey() const = 0;
         virtual size_t bytesUsed() const = 0;
 
+        // for memory usage diagnostics
+        virtual const char* getCategory() const = 0;
+        virtual SkDiscardableMemory* diagnostic_only_getDiscardable() const { return NULL; }
+
         // for SkTDynamicHash::Traits
         static uint32_t Hash(const Key& key) { return key.hash(); }
         static const Key& GetKey(const Rec& rec) { return rec.getKey(); }
@@ -116,6 +119,11 @@ public:
      */
     typedef SkDiscardableMemory* (*DiscardableFactory)(size_t bytes);
 
+    /**
+     *  Will be called for each rec in the cache.
+     */
+    typedef void (*Visitor)(const Rec&, void* context);

[mtklein_C, 2015/08/04 20:27:37]

It'd be nice to have Visitor and VisitAll right next to each other?

[reed1, 2015/08/07 16:19:59]

Done.

+
     /*
      *  The following static methods are thread-safe wrappers around a global
      *  instance of this cache.
@@ -132,6 +140,7 @@ public:
      */
     static bool Find(const Key& key, FindVisitor, void* context);
     static void Add(Rec*);
+    static void VisitAll(Visitor, void* context);
 
     static size_t GetTotalBytesUsed();
     static size_t GetTotalByteLimit();
@@ -143,6 +152,8 @@ public:
 
     static void PurgeAll();
 
+    static void TestDumpMemoryStatistics();
+
     /**
      *  Returns the DiscardableFactory used by the global cache, or NULL.
      */
@@ -194,6 +205,7 @@ public:
      */
     bool find(const Key&, FindVisitor, void* context);
     void add(Rec*);
+    void visitAll(Visitor, void* context);
 
     size_t getTotalBytesUsed() const { return fTotalBytesUsed; }
     size_t getTotalByteLimit() const { return fTotalByteLimit; }