Fix crash with --use-gl=egl on Linux.

content/common/sandbox_linux/bpf_gpu_policy_linux.cc

Index: content/common/sandbox_linux/bpf_gpu_policy_linux.cc
diff --git a/content/common/sandbox_linux/bpf_gpu_policy_linux.cc b/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
index 74f9871fc30a92c8cd3abca5527c5ebb896937d1..d5abb3cf76222f3cd998034619b33d1d292ddc66 100644
--- a/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
+++ b/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
@@ -169,7 +169,12 @@ bool UpdateProcessTypeAndEnableSandbox(sandbox::bpf_dsl::SandboxBPFDSLPolicy* (
 
 }  // namespace
 
-GpuProcessPolicy::GpuProcessPolicy() : broker_process_(NULL) {}
+GpuProcessPolicy::GpuProcessPolicy() : GpuProcessPolicy(false) {
+}
+
+GpuProcessPolicy::GpuProcessPolicy(bool allow_mincore)
+    : broker_process_(NULL), allow_mincore_(allow_mincore) {
+}
 
 GpuProcessPolicy::~GpuProcessPolicy() {}
 
@@ -177,6 +182,13 @@ GpuProcessPolicy::~GpuProcessPolicy() {}
 ResultExpr GpuProcessPolicy::EvaluateSyscall(int sysno) const {
   switch (sysno) {
     case __NR_ioctl:
+      return Allow();
+    case __NR_mincore:
+      if (allow_mincore_) {
+        return Allow();
+      } else {
+        return SandboxBPFBasePolicy::EvaluateSyscall(sysno);
+      }
 #if defined(__i386__) || defined(__x86_64__) || defined(__mips__)
     // The Nvidia driver uses flags not in the baseline policy
     // (MAP_LOCKED | MAP_EXECUTABLE | MAP_32BIT)