private iterator to visit all resource cache entries

src/core/SkMaskCache.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMaskCache.h"
 
 #define CHECK_LOCAL(localCache, localName, globalName, ...) \
@@ skipping 35 matching lines @@
     }
     ~RRectBlurRec() {
         fValue.fData->detachFromCacheAndUnref();
     }
 
     RRectBlurKey   fKey;
     MaskValue      fValue;
 
     const Key& getKey() const override { return fKey; }
     size_t bytesUsed() const override { return sizeof(*this) + fValue.fData->size(); }
+    const char* getCategory() const override { return "rrect-blur"; }
+    SkDiscardableMemory* diagnostic_only_getDiscardable() const override {
+        return fValue.fData->diagnostic_only_getDiscardable();
+    }
 
     static bool Visitor(const SkResourceCache::Rec& baseRec, void* contextData) {
         const RRectBlurRec& rec = static_cast<const RRectBlurRec&>(baseRec);
         MaskValue* result = (MaskValue*)contextData;
 
         SkCachedData* tmpData = rec.fValue.fData;
         tmpData->ref();
         if (NULL == tmpData->data()) {
             tmpData->unref();
             return false;
@@ skipping 71 matching lines @@
     }
     ~RectsBlurRec() {
         fValue.fData->detachFromCacheAndUnref();
     }
 
     RectsBlurKey   fKey;
     MaskValue      fValue;
 
     const Key& getKey() const override { return fKey; }
     size_t bytesUsed() const override { return sizeof(*this) + fValue.fData->size(); }
+    const char* getCategory() const override { return "rects-blur"; }
+    SkDiscardableMemory* diagnostic_only_getDiscardable() const override {
+        return fValue.fData->diagnostic_only_getDiscardable();
+    }
 
     static bool Visitor(const SkResourceCache::Rec& baseRec, void* contextData) {
         const RectsBlurRec& rec = static_cast<const RectsBlurRec&>(baseRec);
         MaskValue* result = static_cast<MaskValue*>(contextData);
 
         SkCachedData* tmpData = rec.fValue.fData;
         tmpData->ref();
         if (NULL == tmpData->data()) {
             tmpData->unref();
             return false;
@@ skipping 17 matching lines @@
     mask->fImage = (uint8_t*)(result.fData->data());
     return result.fData;
 }
 
 void SkMaskCache::Add(SkScalar sigma, SkBlurStyle style, SkBlurQuality quality,
                       const SkRect rects[], int count, const SkMask& mask, SkCachedData* data,
                       SkResourceCache* localCache) {
     RectsBlurKey key(sigma, style, quality, rects, count);
     return CHECK_LOCAL(localCache, add, Add, SkNEW_ARGS(RectsBlurRec, (key, mask, data)));
 }