Disable GPU features if /dev/nvidiactl is inaccessible

content/gpu/gpu_main.cc

Index: content/gpu/gpu_main.cc
===================================================================
--- content/gpu/gpu_main.cc	(revision 129207)
+++ content/gpu/gpu_main.cc	(working copy)
@@ -81,10 +81,22 @@
       LOG(INFO) << "gpu_info_collector::CollectGraphicsInfo failed";
     }
 
+#if defined(OS_LINUX)
+    if (gpu_info.vendor_id == 0x10de) {  // NVIDIA
+      base::ThreadRestrictions::AssertIOAllowed();
+      if (access("/dev/nvidiactl", R_OK) != 0) {
+        LOG(INFO) << "NVIDIA device file /dev/nvidiactl access denied";
+        gpu_info.gpu_accessible = false;
+        dead_on_arrival = true;
+      }
+    }
+#endif
+
     // Set the GPU info even if it failed.
     content::GetContentClient()->SetGpuInfo(gpu_info);
   } else {
     LOG(INFO) << "gfx::GLSurface::InitializeOneOff failed";
+    gpu_info.gpu_accessible = false;
     dead_on_arrival = true;
   }