Add checkbins.py to Win builder on master.chromium. Implement JSON output.

testing/scripts/checkbins.py

Index: testing/scripts/checkbins.py
diff --git a/testing/scripts/webkit_lint.py b/testing/scripts/checkbins.py
old mode 100755
new mode 100644
similarity index 71%
copy from testing/scripts/webkit_lint.py
copy to testing/scripts/checkbins.py
index eeb9367099964777779197dcd86d2e564d08df24..b5174c98a1c0288d3b189bfabdd3816cd34bfc63
--- a/testing/scripts/webkit_lint.py
+++ b/testing/scripts/checkbins.py
@@ -15,17 +15,18 @@ def main_run(args):
   with common.temporary_file() as tempfile_path:
     rc = common.run_command([
         sys.executable,
-        os.path.join(common.SRC_DIR, 'third_party', 'WebKit',
-                     'Tools', 'Scripts', 'lint-test-expectations'),
-        '--json', tempfile_path
+        os.path.join(common.SRC_DIR, 'tools', 'checkbins', 'checkbins.py'),
+        '--verbose',
+        '--json', tempfile_path,
+        os.path.join(args.paths['checkout'], 'out', args.build_config_fs),
     ])
 
     with open(tempfile_path) as f:
-      failures = json.load(f)
+      checkbins_results = json.load(f)
 
   json.dump({
       'valid': True,
-      'failures': failures,
+      'failures': checkbins_results,
   }, args.output)
 
   return rc