[Android] Add fast ELF Symbolizer to pylib.

build/android/pylib/symbols/mock_addr2line/mock_addr2line

Index: build/android/pylib/symbols/mock_addr2line/mock_addr2line
diff --git a/build/android/pylib/symbols/mock_addr2line/mock_addr2line b/build/android/pylib/symbols/mock_addr2line/mock_addr2line
new file mode 100755
index 0000000000000000000000000000000000000000..fd3195af4b4d49a8b930935f61f17e741245d9f1
--- /dev/null
+++ b/build/android/pylib/symbols/mock_addr2line/mock_addr2line
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+# 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.
+
+"""Simple mock for addr2line.
+
+Outputs mock symbol information, with each symbol being a function of the
+original address (so it is easy to double-check consistency in unittests).
+"""
+
+import optparse
+import os
+import posixpath
+import sys
+import time
+
+
+def main(argv):
+  parser = optparse.OptionParser()
+  parser.add_option('-e')  # Path of the debug-library.so.
+  # Silently swallow the other unnecessary arguments.
+  parser.add_option('-C')
+  parser.add_option('-f')
+  options, _ = parser.parse_args(argv[1:])
+  lib_file_name = posixpath.basename(options.e)
+  processed_sym_count = 0
+  sim_crash_period = int(os.environ.get('MOCK_A2L_CRASH_EVERY', 0))
+  sim_hang_period = int(os.environ.get('MOCK_A2L_HANG_EVERY', 0))

[bulach, 2014/02/20 17:35:58]

nit: keep it more consistent with the env, i.e., crash_every and hang_every.

+
+  while(True):
+    line = sys.stdin.readline()
+    if not line:
+      break
+    addr = int(line, 16)
+
+    processed_sym_count += 1
+    if sim_crash_period and processed_sym_count % sim_crash_period == 0:
+      sys.exit(1)
+    if sim_hang_period and processed_sym_count % sim_hang_period == 0:
+      time.sleep(1)
+
+    # Addresses < 1M will return good mock symbol information.
+    if addr < 1024 * 1024:
+      print 'mock_sym_for_addr_%d' % addr
+      print 'mock_src/%s.c:%d' % (lib_file_name, addr)
+
+    # Addresses 1M < x < 2M will return symbols with a name but a missing path.
+    elif addr < 2 * 1024 * 1024:
+      print 'mock_sym_for_addr_%d' % addr
+      print '??:0'
+
+    # Addresses 2M < x < 3M will return unknown symbol information.
+    elif addr < 3 * 1024 * 1024:
+      print '??'
+      print '??'
+
+    sys.stdout.flush()
+
+
+if __name__ == '__main__':
+  main(sys.argv)