Add clang-format binaries and scripts for all platforms

third_party/clang_format/README.txt

Index: third_party/clang_format/README.txt
diff --git a/tools/gn/bin/README.txt b/third_party/clang_format/README.txt
similarity index 55%
copy from tools/gn/bin/README.txt
copy to third_party/clang_format/README.txt
index 99a7ef3d2201e788750d946028955479ff8293f0..b042487bb0087e16c35443fff5096bf862475cd5 100644
--- a/tools/gn/bin/README.txt
+++ b/third_party/clang_format/README.txt
@@ -1,23 +1,25 @@
-This folder contains GN binaries. They should be automatically downloaded from
-Google Storage by gclient runhooks for the current platform.
+This folder contains clang-format binaries. The binaries will be automatically
+downloaded from Google Storage by gclient runhooks for the current platform.
 
+For a walkthrough on how to maintain these binaries:
+  https://code.google.com/p/chromium/wiki/UpdatingClangFormatBinaries
 
 To upload a file:
-  python ~/depot_tools/upload_to_google_storage.py -b chromium-gn <FILENAME>
+  python ~/depot_tools/upload_to_google_storage.py -b chromium-clang-format <FILENAME>
 
 To download a file given a .sha1 file:
-  python ~/depot_tools/download_from_google_storage.py -b chromium-gn -s <FILENAME>.sha1
+  python ~/depot_tools/download_from_google_storage.py -b chromium-clang-format -s <FILENAME>.sha1
 
 List the contents of GN's Google Storage bucket:
-  python ~/depot_tools/third_party/gsutil/gsutil ls gs://chromium-gn/
+  python ~/depot_tools/third_party/gsutil/gsutil ls gs://chromium-clang-format/
 
 To initialize gsutil's credentials:
   python ~/depot_tools/third_party/gsutil/gsutil config
 
   That will give a URL which you should log into with your web browser. The
-  username should be the one that is on the ACL for the "chromium-gn" bucket
-  (probably your @google.com address). Contact the build team for help getting
-  access if necessary.
+  username should be the one that is on the ACL for the "chromium-clang-format"
+  bucket (probably your @google.com address). Contact the build team for help
+  getting access if necessary.
 
   Copy the code back to the command line util. Ignore the project ID (it's OK
   to just leave blank when prompted).