[HttpCache] Store some memcache info to memory dumps for debugging

content/browser/cache_storage/cache_storage_cache_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/cache_storage/cache_storage_cache.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 100 matching lines @@
   }
   std::unique_ptr<Iterator> CreateIterator() override {
     return backend_->CreateIterator();
   }
   void GetStats(base::StringPairs* stats) override {
     return backend_->GetStats(stats);
   }
   void OnExternalCacheHit(const std::string& key) override {
     return backend_->OnExternalCacheHit(key);
   }
-  size_t EstimateMemoryUsage() const override {
+
+  size_t DumpMemoryStats(
+      base::trace_event::ProcessMemoryDump* pmd,
+      const std::string& parent_absolute_name) const override {
     NOTREACHED();
-    return 0;
+    return 0u;
   }
 
   // Call to continue a delayed doom.
   void DoomEntryContinue() {
     EXPECT_FALSE(doom_entry_callback_.is_null());
     doom_entry_callback_.Run();
   }
 
   void set_delay_doom(bool value) { delay_doom_ = value; }
 
@@ skipping 1517 matching lines @@
   EXPECT_EQ(1, sequence_out);
   close_loop2->Run();
   EXPECT_EQ(2, sequence_out);
 }
 
 INSTANTIATE_TEST_CASE_P(CacheStorageCacheTest,
                         CacheStorageCacheTestP,
                         ::testing::Values(false, true));
 
 }  // namespace content