net: boost AES-GCM ciphers if the machine has AES-NI.

base/cpu.h

Index: base/cpu.h
diff --git a/base/cpu.h b/base/cpu.h
index aec24d2f89c3eb435cc5f2f800f04f0f69330bad..276f5954e8e8ede41e046e6e6cdfc481ff6b6e52 100644
--- a/base/cpu.h
+++ b/base/cpu.h
@@ -52,6 +52,7 @@ class BASE_EXPORT CPU {
   // Note: you should never need to call this function. It was added in order
   // to workaround a bug in NSS but |has_avx()| is what you want.
   bool has_avx_hardware() const { return has_avx_hardware_; }
+  bool has_aesni() const { return has_aesni_; }
   bool has_non_stop_time_stamp_counter() const {
     return has_non_stop_time_stamp_counter_;
   }
@@ -79,6 +80,7 @@ class BASE_EXPORT CPU {
   bool has_avx_;
   bool has_avx_hardware_;
   bool has_non_stop_time_stamp_counter_;
+  bool has_aesni_;
   std::string cpu_vendor_;
   std::string cpu_brand_;
 };