[tools/perf] Add a build target for the uploader script

The target will wrap the uploader script with path to
trace_processor_shell as an argument. The Perfetto revision
will be determined automatically by the script itself.

This target is intended to be built by perfetto-uploader CI bots.

Bug: 1050517
Change-Id: I57a93f8268181250a85400b5899e845b5cfa9d97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120427
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754008}

tools/perf/core/perfetto_binary_roller/BUILD.gn

+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/util/generate_wrapper.gni")
+
+generate_wrapper("upload_trace_processor") {
+  data_deps =
+      [ "//third_party/perfetto/src/trace_processor:trace_processor_shell" ]
+  executable = "upload_trace_processor.py"
+  wrapper_script = "$root_build_dir/upload_trace_processor"
+  executable_args = [
+    "--path",
+    "@WrappedPath(./trace_processor_shell)",
+  ]
+}

tools/perf/core/perfetto_binary_roller/upload_trace_processor → tools/perf/core/perfetto_binary_roller/upload_trace_processor.py

@@ -5,6 +5,7 @@
 
 import argparse
 import os
+import subprocess
 import sys
 
 # Add tools/perf to sys.path.
@@ -18,17 +19,29 @@ from core.perfetto_binary_roller import binary_deps_manager
 from core.tbmv3 import trace_processor
 
 
-def main(argv):
+def _PerfettoRevision():
+  perfetto_dir = os.path.join(path_util.GetChromiumSrcDir(), 'third_party',
+                              'perfetto')
+  revision = subprocess.check_output(
+      ['git', '-C', perfetto_dir, 'rev-parse', 'HEAD'])
+  return revision.strip()
+
+
+def main(args):
   parser = argparse.ArgumentParser()
   parser.add_argument(
-      'path', help='Path to trace_processor_shell binary.')
+      '--path', help='Path to trace_processor_shell binary.', required=True)
   parser.add_argument(
-      'revision', help='Perfetto revision.')
-  args = parser.parse_args()
+      '--revision',
+      help=('Perfetto revision. '
+            'If not supplied, will try to infer from //third_party/perfetto.'))
+  args = parser.parse_args(args)
+
+  revision = args.revision or _PerfettoRevision()
 
-  binary_deps_manager.UploadHostBinary(
-      trace_processor.TP_BINARY_NAME, args.path, args.revision)
+  binary_deps_manager.UploadHostBinary(trace_processor.TP_BINARY_NAME,
+                                       args.path, revision)
 
 
 if __name__ == '__main__':
-  sys.exit(main(sys.argv))
+  sys.exit(main(sys.argv[1:]))