Add ash to the GN build.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 62d882c7ec8328f303d3459e508f7cd183d95278..501beb9e6313c1e129e6ad83cfa2962ff2f4b6ab 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -18,7 +18,7 @@ group("root") {
   deps = [
     # This is a temporary test of the not-yet-complete NaCl cross-compilation.
     #"//base(//build/toolchain/nacl:x86_newlib)",
-
+    "//ash",
     "//cc",
     "//chrome/browser",
     "//chrome/browser/devtools",
@@ -162,6 +162,8 @@ group("root") {
       # Seems to not be compiled on Android. Otherwise it will need a config.h.
       "//third_party/libxslt",
 
+      # Not relevant to Android.
+      "//ash",
       "//tools/gn",
       "//ui/aura",