Implement SysInfo for iOS

base/sys_info_mac.cc

Index: base/sys_info_mac.cc
diff --git a/base/sys_info_mac.cc b/base/sys_info_mac.cc
index d8210a299932571fd0d41042918daf38e06577e3..2e0df72cf8b4996e4374a4512a07109800293bc4 100644
--- a/base/sys_info_mac.cc
+++ b/base/sys_info_mac.cc
@@ -46,7 +46,10 @@ int64 SysInfo::AmountOfPhysicalMemory() {
                          HOST_BASIC_INFO,
                          reinterpret_cast<host_info_t>(&hostinfo),
                          &count);
-  DCHECK_EQ(HOST_BASIC_INFO_COUNT, count);
+  if (count != HOST_BASIC_INFO_COUNT) {

[Mark Mentovai, 2012/07/10 16:10:04]

Again, I asked you to check result before you checked count. Instead, you
changed the DCHECK into a live check. I think the DCHECK is fine. In fact, I
prefer it. But you can’t look at count until you’ve made sure that result is
KERN_SUCCESS.

[Chen Yu, 2012/07/10 17:07:30]

Done.

+    NOTREACHED();
+    return 0;
+  }
   if (result != KERN_SUCCESS) {
     NOTREACHED();
     return 0;