Add a CRYPTO_BUFFER_POOL to SSLClientSocketImpl.

net/cert/x509_util_openssl.cc

Index: net/cert/x509_util_openssl.cc
diff --git a/net/cert/x509_util_openssl.cc b/net/cert/x509_util_openssl.cc
index 4a2aba01dc60aa7df5163741d2faab3526e25f96..4e79ad8a2115cad3b04d4e9048ad8efe7e094be1 100644
--- a/net/cert/x509_util_openssl.cc
+++ b/net/cert/x509_util_openssl.cc
@@ -25,6 +25,7 @@
 #include "third_party/boringssl/src/include/openssl/asn1.h"
 #include "third_party/boringssl/src/include/openssl/digest.h"
 #include "third_party/boringssl/src/include/openssl/mem.h"
+#include "third_party/boringssl/src/include/openssl/pool.h"
 
 namespace net {
 
@@ -190,6 +191,19 @@ class DERCacheInitSingleton {
 base::LazyInstance<DERCacheInitSingleton>::Leaky g_der_cache_singleton =
     LAZY_INSTANCE_INITIALIZER;
 
+class BufferPoolSingleton {
+ public:
+  BufferPoolSingleton() : pool_(CRYPTO_BUFFER_POOL_new()) {}
+  CRYPTO_BUFFER_POOL* pool() { return pool_; }
+
+ private:
+  // The singleton is leaky, so there is no need to use a smart pointer.
+  CRYPTO_BUFFER_POOL* pool_;
+};
+
+base::LazyInstance<BufferPoolSingleton>::Leaky g_buffer_pool_singleton =
+    LAZY_INSTANCE_INITIALIZER;
+
 }  // namespace
 
 bool CreateSelfSignedCert(crypto::RSAPrivateKey* key,
@@ -347,6 +361,10 @@ bool GetTLSServerEndPointChannelBinding(const X509Certificate& certificate,
   return true;
 }
 
+CRYPTO_BUFFER_POOL* GetBufferPool() {
+  return g_buffer_pool_singleton.Get().pool();
+}
+
 }  // namespace x509_util
 
 }  // namespace net