Tighten up gn check.

.gn

 # This file is used by the experimental meta-buildsystem in src/tools/gn to
 # find the root of the source tree and to set startup options.
 
 # The location of the build configuration file.
 buildconfig = "//build/config/BUILDCONFIG.gn"
 
 # The secondary source root is a parallel directory tree where
 # GN build files are placed when they can not be placed directly
 # in the source tree, e.g. for third party source trees.
 secondary_source = "//build/secondary/"
 
 # The set of targets known to pass 'gn check'. When all targets pass, remove
 # this.
 check_targets = [
+  "//apps/*",
+  "//base/*",
+  "//benchmarks/*",
+  "//build/*",
+  "//buildtools/*",
   "//cc/*",
   "//crypto/*",
   "//dart/*",
+  "//device/*",
   "//examples/*",
   "//gin/*",
   "//mojo/*",
   "//mojom/*",
+  "//native_client/*",
   "//services/*",
   "//shell/*",
   "//skia/*",
-  "//sky/*",
+  "//testing/*",
+  "//tools/*",
   "//ui/*",
   "//url/*",
+  "//v8/*",
 ]