Add cpplint to third_party

.gclient

@@ -30,6 +30,11 @@ solutions = [{
     'https://chromium.googlesource.com/chromium/src/third_party/zlib@39b4a6260702da4c089eca57136abf40a39667e9',
     'name':
     'third_party/zlib'
+}, {
+    'url':
+    'https://github.com/cpplint/cpplint.git@a33992f68f36fcaa6d0f531a25012a4c474d3542',
+    'name':
+    'third_party/cpplint'
 }, {
     'url':
     'https://github.com/rust-lang/libc.git@8a85d662b90c14d458bc4ae9521a05564e20d7ae',

.gitignore

@@ -2,6 +2,7 @@
 node_modules
 /v8/
 /tools/protoc_wrapper/
+/third_party/cpplint/
 /third_party/protobuf/
 /third_party/zlib/
 /third_party/rust_crates/libc/

tools/lint.sh

@@ -1,7 +1,11 @@
 #!/bin/sh
+# TODO(ry) Rewrite this script in python for portability to Windows.
+# TODO(ry) Call tslint here too.
 set -e
 cd `dirname "$0"`/..
-cpplint --filter=-build/include_subdir --repository=src  \
+./third_party/cpplint/cpplint.py \
+  --filter=-build/include_subdir \
+  --repository=src  \
   src/*.cc \
   src/*.h \
   src/include/*.h