Convert print statements to Python 3 style

Ran "2to3 -w -n -f print ./" and manually added imports.
Ran "^\s*print " and "\s+print " to find batch/shell scripts, comments and the like with embedded code, and updated them manually.
Also manually added imports to files, which used print as a function, but were missing the import.

The scripts still work with Python 2.
There are no intended behaviour changes.

Bug: 942522
Change-Id: Id777e4d4df4adcdfdab1b18bde89f235ef491b9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1595684
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Auto-Submit: Raul Tambre <raul@tambre.ee>
diff --git a/compile_single_file.py b/compile_single_file.py
index e60f830..833e03e 100644
--- a/compile_single_file.py
+++ b/compile_single_file.py
@@ -3,6 +3,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from __future__ import print_function
+
 import argparse
 import os
 import subprocess
@@ -47,7 +49,7 @@
   abs_build_dir = os.path.join(src_dir, options.build_dir)
   src_relpath = os.path.relpath(options.file_path, abs_build_dir)
 
-  print 'Building %s' % options.file_path
+  print('Building %s' % options.file_path)
 
   ninja_exec = 'ninja'
   carets = '^'