Roll chromium_revision 5333e14..d8f8dc8 (323410:324211)

We used to symlink the .gn file from Chromium but it's now
replaced by our own copy (needed for recent GN changes in
https://codereview.chromium.org/988563002).

Relevant changes:
* src/third_party/boringssl/src: e2e1326..40acdae
* src/third_party/icu: 46be516..10834e8
* src/third_party/nss: bb4e75a..d1edb68
* src/tools/gyp: d174d75..2889664

The entries for
* src/third_party/jsoncpp/source/include
* src/third_party/jsoncpp/source/src/lib_json
are removed and replaced by:
* src/third_party/jsoncpp/source @ab1e40f
(which doesn't matter for us since we symlink third_party/jsoncpp

Details: https://chromium.googlesource.com/chromium/src/+/5333e14..d8f8dc8/DEPS

Clang version was not updated in this roll.

R=henrika@webrtc.org, pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/48919004

Cr-Commit-Position: refs/heads/master@{#8959}
diff --git a/.gn b/.gn
new file mode 100644
index 0000000..2b698d3
--- /dev/null
+++ b/.gn
@@ -0,0 +1,48 @@
+# Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+# The location of the build configuration file.
+buildconfig = "//build/config/BUILDCONFIG.gn"
+
+# The secondary source root is a parallel directory tree where
+# GN build files are placed when they can not be placed directly
+# in the source tree, e.g. for third party source trees.
+secondary_source = "//build/secondary/"
+
+# These are the targets to check headers for by default. The files in targets
+# matching these patterns (see "gn help label_pattern" for format) will have
+# their includes checked for proper dependencies when you run either
+# "gn check" or "gn gen --check".
+check_targets = [
+  "//webrtc/*",
+]
+
+# These are the list of GN files that run exec_script. This whitelist exists
+# to force additional review for new uses of exec_script, which is strongly
+# discouraged except for gypi_to_gn calls.
+exec_script_whitelist = [
+  "//build/config/android/BUILD.gn",
+  "//build/config/android/config.gni",
+  "//build/config/android/internal_rules.gni",
+  "//build/config/android/rules.gni",
+  "//build/config/compiler/BUILD.gn",
+  "//build/config/gcc/gcc_version.gni",
+  "//build/config/ios/ios_sdk.gni",
+  "//build/config/linux/BUILD.gn",
+  "//build/config/linux/pkg_config.gni",
+  "//build/config/mac/mac_sdk.gni",
+  "//build/config/win/visual_studio_version.gni",
+  "//build/gn_helpers.py",
+  "//build/gypi_to_gn.py",
+  "//build/toolchain/gcc_toolchain.gni",
+  "//build/toolchain/mac/BUILD.gn",
+  "//build/toolchain/win/BUILD.gn",
+  "//third_party/boringssl/BUILD.gn",
+  "//third_party/opus/BUILD.gn",
+  "//webrtc/modules/video_render/BUILD.gn",
+]