Add a new driver bug workaround SANDBOX_START_EARLY

base/sys_info_posix.cc

Index: base/sys_info_posix.cc
diff --git a/base/sys_info_posix.cc b/base/sys_info_posix.cc
index 85ae039118986d211ea3964e38f271c4beb3a026..0ed9065ef9f03d4890856652490f8c2ee95c91b4 100644
--- a/base/sys_info_posix.cc
+++ b/base/sys_info_posix.cc
@@ -113,8 +113,8 @@ std::string SysInfo::OperatingSystemName() {
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 // static
 std::string SysInfo::OperatingSystemVersion() {
-  struct utsname info;
-  if (uname(&info) < 0) {
+  static struct utsname info = {};
+  if (!strlen(info.release) && uname(&info) < 0) {

[piman, 2016/05/06 19:53:11]

This is not thread safe. Why the change?

[Julien Isorce Samsung, 2016/05/07 08:18:13]

Txh for pointing that, well I made this change because uname is used from
GpuControlList when calling gpu::ApplyGpuDriverBugWorkarounds. This is a problem
when switches::kGpuSandboxStartEarly is set. On arm when kGpuSandboxStartEarly
is set they solve that by enabling uname from the sandbox policy directly since
they do not use the common GpuProcessPolicy but they use
CrosArmGpuProcessPolicy::EvaluateSyscall instead.

     NOTREACHED();
     return std::string();
   }