Add more targets to GN check.

.gn

 # This file is used by the GN meta build system to find the root of the source
 # tree and to set startup options. For documentation on the values set in this
 # file, run "gn help dotfile" at the command line.
 
 # 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/"
 
 # These are the targets to check headers for by default. The files in targets
 # matching these patterns (see "gn help label_pattern" for format) will have
 # their includes checked for proper dependencies when you run either
 # "gn check" or "gn gen --check".
 check_targets = [
+  #"//apps/*",  # Medium-hard.
+  #"//ash/*",  # Medium-hard.
   # Requires GN binary >= 314794 and to mark the "...__generate_enum" action in
   # build/config/android/rules.gni "java_cpp_enum" template with
   #   check_includes = false.
   #"//base/*",
+  "//blink/*",
+  "//breakpad/*",
   "//build/*",
   "//cc/*",
+
+  #"//chrome/*",  # Epic number of errors.
+  "//chromecast/*",
+  "//chrome_elf/*",
+  "//cloud_print/*",
+
+  #"//components/*",  # Lots of errors.
+  #"//content/*",  # A whole lot of errors.
+  "//courgette/*",
+  "//crypto/*",
+  "//data/*",
   "//dbus/*",
   "//device/*",
+
+  #"//extensions/*",  # Lots of errors.
+  #"//gin/*",  # Easy.
+  #"//google_apis/*",  # Easy.
+  "//google_update/*",
+
+  #"//gpu/*",  # Lots of errors.
+  #"//ios/*",
   "//ipc/*",
+
+  #"//jingle/*",
+  #"//media/*",  # Lots of errors.
+  #"//mojo/*",
+  #"//native_client/*",
+  "//net/*",
+
+  #"//pdf/*",  # Medium-hard.
+  #"//ppapi/*",  # Lots of errors.
+  "//printing/*",
+
+  #"//remoting/*",  # Medium-hard.
+  #"//rlz/*",  # Needs checking on Windows.
+  #"//sandbox/*",  # Medium-hard.
+  "//sdch/*",
+  "//skia/*",
   "//sql/*",
   "//storage/*",
+  "//sync/*",
+  "//testing/*",
+
+  #"//third_party/*",  # May not ever want this.
+  "//tools/*",
+
+  #"//ui/*",  # Just a few problems.
   "//url/*",
+  "//v8/*",
 ]