Fix checkdeps.py to check all the source directories in git checkouts.

BUG=33165
TEST=Manual: add an invalid #include in ppapi/examples/ime/ime.cc and
verify it to be correctly warned.


Review URL: http://codereview.chromium.org/8416016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107668 0039d316-1c4b-4281-b951-d872f2087c98

tools/checkdeps/checkdeps.py

@@ -416,7 +416,10 @@ def GetGitSourceDirectory(root):
                        pipes.quote(root))
   for line in popen_out.readlines():
     dir_name = os.path.join(root, os.path.dirname(line))
-    git_source_directory.add(dir_name)
+    # Add the directory as well as all the parent directories.
+    while dir_name != root:
+      git_source_directory.add(dir_name)
+      dir_name = os.path.dirname(dir_name)
   git_source_directory.add(root)
   return git_source_directory