clang: Add a tool for MessageLoop refactoring

tools/clang/scripts/run_tool.py

Index: tools/clang/scripts/run_tool.py
diff --git a/tools/clang/scripts/run_tool.py b/tools/clang/scripts/run_tool.py
index 58a9a86570c6b3b203d5a0004ce56d04426db314..16c8cb32f5d76a6942370f4ef50a59bd8543b274 100755
--- a/tools/clang/scripts/run_tool.py
+++ b/tools/clang/scripts/run_tool.py
@@ -318,7 +318,7 @@ def main(argv):
   else:
     filenames = set(_GetFilesFromGit(argv[2:]))
     # Filter out files that aren't C/C++/Obj-C/Obj-C++.
-    extensions = frozenset(('.c', '.cc', '.m', '.mm'))
+    extensions = frozenset(('.c', '.cc', '.h', '.m', '.mm'))

[dcheng, 2015/05/06 17:31:18]

Why does this need to change? There (should) never be header files as compile
rules in the compile DB.

[Sami, 2015/05/07 10:37:37]

IIRC without this some .h files were never getting rewritten. I'll take this out
for now and put together another CL if I run into this again.

[Sami, 2015/05/07 13:31:35]

Yeah, turns out if I don't do this, none of the .h files get edited. I think
it's because _ApplyEdits below limits the edits to files to with matching
extensions.

     filenames = [f for f in filenames
                  if os.path.splitext(f)[1] in extensions]
   dispatcher = _CompilerDispatcher(argv[0], argv[1], filenames)