Track SimpleCache memory usage in net/ MemoryDumpProvider

net/http/http_cache_transaction.h

Index: net/http/http_cache_transaction.h
diff --git a/net/http/http_cache_transaction.h b/net/http/http_cache_transaction.h
index 32bb23571f48a0a868288b492a1f55dacf48f9cd..2d249c1eda028c6329ed2edc603bfc2f4064a082 100644
--- a/net/http/http_cache_transaction.h
+++ b/net/http/http_cache_transaction.h
@@ -164,6 +164,9 @@ class HttpCache::Transaction : public HttpTransaction {
   int ResumeNetworkStart() override;
   void GetConnectionAttempts(ConnectionAttempts* out) const override;
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   static const size_t kNumValidationHeaders = 2;
   // Helper struct to pair a header name with its value, for