Introduce GN config files.

GITDEPS

Index: GITDEPS
diff --git a/GITDEPS b/GITDEPS
index e2c1f0f691f839e1619c70d2ba3cd0304e483c33..f33eb713cf2994d423fc187be515f7d026cb4ac3 100644
--- a/GITDEPS
+++ b/GITDEPS
@@ -16,9 +16,13 @@
 # through sparse checkouts.
 
 vars = {
-  "chrome_revision": "HEAD",
-  "gyp_revision": "bac4680ec9a5c55ab692490b6732999648ecf1e9",
   "chrome_base_git": "https://chromium.googlesource.com/",
+
+  "ced_revision": "9012c0ab648025dd0f8df14294bf5d6d73793ac9",
+  "chrome_revision": "080936f5193590e65409c60127a510f71e910d73",
+  "gmock_revision": "0421b6f358139f02e102c9c332ce19a33faf75be",
+  "gtest_revision": "6f8a66431cb592dad629028a50b3dd418a408c87",
+  "gyp_revision": "bac4680ec9a5c55ab692490b6732999648ecf1e9",
 }
 
 deps = {
@@ -28,16 +32,33 @@ deps = {
       # Chrome base and other top-level dependencies.
       "base",
       "build",
+      "build_overrides",
       "testing",
       "tools",
 
       # third_party dependencies.
+      "third_party/ced",
+      "third_party/libxml",
+      "third_party/modp_b64",
       "third_party/protobuf",
+      "third_party/zlib",
     ],
     Var("chrome_revision")
   ),
+  "third_party/ced/src":
+    (Var("chrome_base_git") + "external/github.com/google/compact_enc_det.git",
+     [],
+     Var("ced_revision")),
   "tools/gyp":
     (Var("chrome_base_git") + "external/gyp/",
-    [],
-    Var("gyp_revision")),
+     [],
+     Var("gyp_revision")),
+  "testing/gmock":
+    (Var("chrome_base_git") + "external/googlemock.git/",
+     [],
+     Var("gmock_revision")),
+  "testing/gtest":
+    (Var("chrome_base_git") + "external/github.com/google/googletest.git/",
+     [],
+     Var("gtest_revision")),
 }