Implement '--gpu-sandbox-failures-nonfatal' flag.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 4ae79599b0757d93dc09df60aeb5a318d1e0a628..98cce4f257750d6814b09313c71e7a59ddd70f35 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -645,6 +645,9 @@ const char kGpuProcess[]                    = "gpu-process";
 // Allow shmat system call in GPU sandbox.
 const char kGpuSandboxAllowSysVShm[]        = "gpu-sandbox-allow-sysv-shm";
 
+// Makes GPU sandbox failures nonfatal.
+const char kGpuSandboxFailuresNonfatal[]    = "gpu-sandbox-failures-nonfatal";
+
 // Causes the GPU process to display a dialog on launch.
 const char kGpuStartupDialog[]              = "gpu-startup-dialog";