Stub clang plugin to check consistency of the Blink GC infrastructure.

tools/clang/scripts/blink_gc_plugin_flags.sh

Index: tools/clang/scripts/blink_gc_plugin_flags.sh
diff --git a/tools/clang/scripts/blink_gc_plugin_flags.sh b/tools/clang/scripts/blink_gc_plugin_flags.sh
new file mode 100755
index 0000000000000000000000000000000000000000..9ef22e3f44d19fbf55653f0ad9439edd559eea46
--- /dev/null
+++ b/tools/clang/scripts/blink_gc_plugin_flags.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Copyright (c) 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This script returns the flags that should be passed to clang.
+
+THIS_ABS_DIR=$(cd $(dirname $0) && echo $PWD)
+CLANG_LIB_PATH=$THIS_ABS_DIR/../../../third_party/llvm-build/Release+Asserts/lib
+
+if uname -s | grep -q Darwin; then
+  LIBSUFFIX=dylib
+else
+  LIBSUFFIX=so
+fi
+
+echo -Xclang -load -Xclang $CLANG_LIB_PATH/libBlinkGCPlugin.$LIBSUFFIX \
+  -Xclang -add-plugin -Xclang blink-gc-plugin