Add components and CLD to GN build.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index aa66b894a81f4777c4f801bb7b5dba9e0447f537..114ce1be29e7a4e8ac218e0aa3c067f3b95c18fc 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -16,6 +16,18 @@ declare_args() {
   android_full_debug = false
 }
 
+# default_include_dirs ---------------------------------------------------------
+#
+# This is a separate config so that third_party code (which would not use the
+# source root and might have conflicting versions of some headers) can remove
+# this and specify their own include paths.
+config("default_include_dirs") {
+  include_dirs = [
+    "//",
+    root_gen_dir,
+  ]
+}
+
 # compiler ---------------------------------------------------------------------
 #
 # Base compiler configuration.
@@ -29,9 +41,6 @@ config("compiler") {
   cflags_cc = []
   ldflags = []
   defines = []
-  include_dirs = []
-
-  include_dirs += [ "//", root_gen_dir ]
 
   # In general, Windows is totally different, but all the other builds share
   # some common GCC configuration. This section sets up Windows and the common