Re-add the CQ directory to chrome/trunk/tools.

This directory is still pulled by DEPS and is in official Buildspecs.
Re-add it for now until we can remove it from all of those.

TBR=maruel@chromium.org,cmp@chromium.org

Review URL: https://codereview.chromium.org/224913004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/commit-queue@261659 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/placeholder.txt b/placeholder.txt
new file mode 100644
index 0000000..7fd3f0a
--- /dev/null
+++ b/placeholder.txt
@@ -0,0 +1 @@
+This is a placeholder file. This directory is still pulled by some deps files.
diff --git a/post_processors/__init__.py b/post_processors/__init__.py
deleted file mode 100644
index e69de29..0000000
--- a/post_processors/__init__.py
+++ /dev/null
diff --git a/verification/__init__.py b/verification/__init__.py
deleted file mode 100644
index e69de29..0000000
--- a/verification/__init__.py
+++ /dev/null