Introduce GN config files.

GITDEPS

 # Copyright 2015 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 # This file is read by gitdeps.py to allow loading subsections of git repos
 # through sparse checkouts.
 
 vars = {
-  "chrome_revision": "HEAD",
+  "chrome_base_git": "https://chromium.googlesource.com/",
+
+  "ced_revision": "9012c0ab648025dd0f8df14294bf5d6d73793ac9",
+  "chrome_revision": "080936f5193590e65409c60127a510f71e910d73",
+  "gmock_revision": "0421b6f358139f02e102c9c332ce19a33faf75be",
+  "gtest_revision": "6f8a66431cb592dad629028a50b3dd418a408c87",
   "gyp_revision": "bac4680ec9a5c55ab692490b6732999648ecf1e9",
-  "chrome_base_git": "https://chromium.googlesource.com/",
 }
 
 deps = {
   "":(
     Var("chrome_base_git") + "chromium/src",
     [
       # 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")),
 }