[tools/perf] Get Perfetto revision from DEPS file

An isolated script doesn't see git files, so it can't determine the
revision from repo. So we parse the DEPS file instead.

Bug: b/148778752
Change-Id: Ic156d48f983bb65792f904efdadf6929d9cbc961
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139817Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#757053}

tools/perf/core/perfetto_binary_roller/BUILD.gn

@@ -7,10 +7,13 @@ import("//build/util/generate_wrapper.gni")
 generate_wrapper("upload_trace_processor") {
   testonly = true
   data_deps = [
+    "//third_party/catapult:telemetry_chrome_test_support",
     "//third_party/perfetto/src/trace_processor:trace_processor_shell",
-    "//tools/perf/chrome_telemetry_build:telemetry_chrome_test_without_chrome",
   ]
-  data = [ "//third_party/perfetto" ]
+  data = [
+    "//tools/perf/core/",
+    "//DEPS",
+  ]
   executable = "upload_trace_processor.py"
   wrapper_script = "$root_build_dir/upload_trace_processor"
   executable_args = [

tools/perf/core/perfetto_binary_roller/upload_trace_processor.py

@@ -5,7 +5,7 @@
 
 import argparse
 import os
-import subprocess
+import re
 import sys
 
 # Add tools/perf to sys.path.
@@ -20,11 +20,15 @@ from core.tbmv3 import trace_processor
 
 
 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()
+  deps_line_re = re.compile(
+      r".*'/platform/external/perfetto.git' \+ '@' \+ '([a-f0-9]+)'")
+  deps_file = os.path.join(path_util.GetChromiumSrcDir(), 'DEPS')
+  with open(deps_file) as deps:
+    for line in deps:
+      match = deps_line_re.match(line)
+      if match:
+        return match.group(1)
+  raise RuntimeError("Couldn't parse perfetto revision from DEPS")
 
 
 def main(args):