Provide a way to disable libpci dependency.

gpu/config/BUILD.gn

Index: gpu/config/BUILD.gn
diff --git a/gpu/config/BUILD.gn b/gpu/config/BUILD.gn
index 4dab028213cc494d3f17b87774241356e7951aa8..0502ead84b2beee2183dcfacf9af72f025e9a944 100644
--- a/gpu/config/BUILD.gn
+++ b/gpu/config/BUILD.gn
@@ -48,6 +48,9 @@ source_set("config") {
     "//ui/gl",
   ]
 
+  # Use the PCI lib to collect GPU information on Linux.
+  use_libpci = true

[piman, 2014/10/31 18:29:28]

Should this be in a declare_args() block so that you can disable it at gn time?

[brettw, 2014/10/31 19:20:06]

Yes, what you did here will always disable pci.

+
   # Prefer mesa GL headers to system headers, which cause problems on Win.
   include_dirs = [ "//third_party/mesa/src/include" ]
 
@@ -62,7 +65,10 @@ source_set("config") {
       ]
     }
   }
-  if (is_linux && (use_x11 || use_ozone)) {
+  if (use_libpci) {
+    defines += [ "USE_LIBPCI=1" ]
+  }
+  if (is_linux && use_libpci && (use_x11 || use_ozone)) {
     deps += [
       "//build/config/linux:libpci",
     ]