ozone: Fix GN build for ozone_egl_demo, ozone_unittests

build/config/linux/BUILD.gn

Index: build/config/linux/BUILD.gn
diff --git a/build/config/linux/BUILD.gn b/build/config/linux/BUILD.gn
index 48b78a4e40d4130e547300a01edce1d1247c5aaa..88e51c53e49dcb7c3c8d2ec606dd2f440a168dba 100644
--- a/build/config/linux/BUILD.gn
+++ b/build/config/linux/BUILD.gn
@@ -21,10 +21,14 @@ config("sdk") {
   }
 }
 
-pkg_config("dridrm") {
+pkg_config("libdrm") {
   packages = [ "libdrm" ]
 }
 
+pkg_config("gbm") {
+  packages = [ "gbm" ]

[brettw, 2014/07/23 00:32:32]

"pkg-config --libs-only-l gbm" fails on my system so this is probably not what
we want.

I think we'll want this in one of the ui/ozone directories and to surround it
with an if that defines it only if gbm is enabled.

[spang, 2014/07/23 17:27:56]

We did add this library to install-build-deps.sh, but making it conditional will
probably be less disruptive without any downside. Moved.

+}
+
 config("fontconfig") {
   libs = [ "fontconfig" ]
 }