Add apps to the GN build.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 196962aa9bf78d9634a3c317b656db83bdadc515..15084b1545ad35d5762a933d1abf3abdee9e2cc0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -16,8 +16,7 @@ group("root") {
   # currently written but not hooked up to the build yet. They may need to be
   # completed or possibly just tested and then re-enabled.
   deps = [
-    # This is a temporary test of the not-yet-complete NaCl cross-compilation.
-    #"//base(//build/toolchain/nacl:x86_newlib)",
+    "//apps",
     "//ash",
     "//cc",
     "//cc/blink",
@@ -163,6 +162,7 @@ group("root") {
     ]
 
     deps -= [
+      "//apps",  # Needs testing.
       "//cc/blink", # Blocked on blink
       "//chrome/browser",  # Blocked on content.
       "//chrome/browser/devtools",  # Blocked on content.