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

base/cpu.cc

Index: base/cpu.cc
diff --git a/base/cpu.cc b/base/cpu.cc
index dec98bd7a1e82b5e8162a163200de415a513dfde..66207a1e0b8b0539b99a72b85435936f847803bb 100644
--- a/base/cpu.cc
+++ b/base/cpu.cc
@@ -37,6 +37,7 @@ CPU::CPU()
     has_sse42_(false),
     has_avx_(false),
     has_avx_hardware_(false),
+    has_aesni_(false),
     has_non_stop_time_stamp_counter_(false),
     cpu_vendor_("unknown") {
   Initialize();
@@ -131,6 +132,7 @@ void CPU::Initialize() {
         has_avx_hardware_ &&
         (cpu_info[2] & 0x08000000) != 0 /* OSXSAVE */ &&
         (_xgetbv(0) & 6) == 6 /* XSAVE enabled by kernel */;
+    has_aesni_ = (cpu_info[2] & 0x02000000) != 0;
   }
 
   // Get the brand string of the cpu.