adb_profile_chrome: Add perf profiler

build/android/chrome_profiler/trace_packager.py

+# Copyright 2014 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 gzip
+import json
+import os
+import shutil
+import sys
+import zipfile
+
+from chrome_profiler import util
+
+from pylib import constants
+
+sys.path.append(os.path.join(constants.DIR_SOURCE_ROOT,
+                             'third_party',
+                             'trace-viewer'))
+# pylint: disable=F0401
+from trace_viewer.build import trace2html
+
+
+def _PackageTracesAsHtml(trace_files, html_file):
+  with open(html_file, 'w') as f:
+    trace2html.WriteHTMLForTracesToFile(trace_files, f)
+  for trace_file in trace_files:
+    os.unlink(trace_file)
+
+
+def _CompressFile(host_file, output):
+  with gzip.open(output, 'wb') as out, \
+      open(host_file, 'rb') as input_file:
+    out.write(input_file.read())
+  os.unlink(host_file)
+
+
+def _ArchiveFiles(host_files, output):
+  with zipfile.ZipFile(output, 'w', zipfile.ZIP_DEFLATED) as z:
+    for host_file in host_files:
+      z.write(host_file)
+      os.unlink(host_file)
+
+
+def _MergeTracesIfNeeded(trace_files):
+  if len(trace_files) <= 1:
+    return trace_files
+  merge_candidates = []
+  for trace_file in trace_files:
+    with open(trace_file) as f:
+      # Try to detect a JSON file cheaply since that's all we can merge.
+      if f.read(1) != '{':
+        continue
+      f.seek(0)
+      try:
+        json_data = json.load(f)
+      except ValueError:
+        continue
+      merge_candidates.append((trace_file, json_data))
+  if len(merge_candidates) <= 1:
+    return trace_files
+
+  other_files = [f for f in trace_files
+                 if not f in [c[0] for c in merge_candidates]]
+  merged_file, merged_data = merge_candidates[0]
+  for trace_file, json_data in merge_candidates[1:]:
+    for key, value in json_data.items():
+      if not merged_data.get(key) or json_data[key]:
+        merged_data[key] = value
+    os.unlink(trace_file)
+
+  with open(merged_file, 'w') as f:
+    json.dump(merged_data, f)
+  return [merged_file] + other_files
+
+
+def PackageTraces(trace_files, output=None, compress=False, write_json=False):
+  trace_files = _MergeTracesIfNeeded(trace_files)
+  if not write_json:
+    html_file = os.path.splitext(trace_files[0])[0] + '.html'
+    _PackageTracesAsHtml(trace_files, html_file)
+    trace_files = [html_file]
+
+  if compress and len(trace_files) == 1:
+    result = output or trace_files[0] + '.gz'
+    _CompressFile(trace_files[0], result)
+  elif len(trace_files) > 1:
+    result = output or 'chrome-combined-trace-%s.zip' % util.GetTraceTimestamp()
+    _ArchiveFiles(trace_files, result)
+  elif output:
+    result = output
+    shutil.move(trace_files[0], result)
+  else:
+    result = trace_files[0]
+  return result