Move gecko_bindings and gecko_string_cache into the style crate

components/style/binding_tools/setup_bindgen.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+# Run in the tools directory.
+cd "$(dirname ${0})"
+
+# Setup and build bindgen.
+if [[ "$(uname)" == "Linux" ]]; then
+  export LIBCLANG_PATH=/usr/lib/llvm-3.8/lib
+else
+  export LIBCLANG_PATH="$(brew --prefix llvm38)/lib/llvm-3.8/lib"
+fi
+
+# Make sure we have llvm38.
+if [[ ! -x "$(command -v clang-3.8)" ]]; then
+    echo "llmv38 must be installed." \
+         "Mac users should |brew install llvm38|, Linux varies by distro."
+    exit 1
+fi
+
+export LD_LIBRARY_PATH="${LIBCLANG_PATH}"
+export DYLD_LIBRARY_PATH="${LIBCLANG_PATH}"
+
+# Check for multirust
+if [[ ! -x "$(command -v multirust)" ]]; then
+    echo "multirust must be installed."
+    exit 1
+fi
+
+# Don't try to clone twice.
+if [[ ! -d rust-bindgen ]]; then
+  git clone https://github.com/servo/rust-bindgen.git
+fi
+
+cd rust-bindgen
+
+multirust override nightly
+cargo build --features llvm_stable