Implement SkImageFilter::Cache with SkResourceCache.

src/core/SkResourceCache.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkChecksum.h"
 #include "SkMessageBus.h"
 #include "SkMipMap.h"
@@ skipping 640 matching lines @@
 
 size_t SkGraphics::GetResourceCacheSingleAllocationByteLimit() {
     return SkResourceCache::GetSingleAllocationByteLimit();
 }
 
 size_t SkGraphics::SetResourceCacheSingleAllocationByteLimit(size_t newLimit) {
     return SkResourceCache::SetSingleAllocationByteLimit(newLimit);
 }
 
 void SkGraphics::PurgeResourceCache() {
-    SkImageFilter::PurgeCache();
     return SkResourceCache::PurgeAll();
 }
 
 /////////////
 
 static void dump_visitor(const SkResourceCache::Rec& rec, void*) {
     SkDebugf("RC: %12s bytes %9lu  discardable %p\n",
              rec.getCategory(), rec.bytesUsed(), rec.diagnostic_only_getDiscardable());
 }
 
@@ skipping 11 matching lines @@
         dump->dumpNumericValue(dumpName.c_str(), "size", "bytes", rec.bytesUsed());
         dump->setMemoryBacking(dumpName.c_str(), "malloc", nullptr);
     }
 }
 
 void SkResourceCache::DumpMemoryStatistics(SkTraceMemoryDump* dump) {
     // Since resource could be backed by malloc or discardable, the cache always dumps detailed
     // stats to be accurate.
     VisitAll(sk_trace_dump_visitor, dump);
 }