android: Reimplement adb_profile_chrome in Python

build/android/adb_profile_chrome

 #!/bin/bash
 #
 # Copyright 2013 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.
 #
 # Start / stop profiling in chrome.
-
-# The profiling data is saved to directory /sdcard/Download. The files
-# are named beginning chrome-profile-results-
-#
-# Assumes you have sourced the android build environment script
-# (e.g. 'adb' is on your path).
-set -e
-
-usage() {
-  echo "adb_profile_chrome [--start [-o file] [-c C]|--stop|-d|-t N] [-v N]"
-  echo "See http://dev.chromium.org/developers/how-tos/trace-event-profiling-tool for detailed instructions on profiling."
-  echo ""
-  echo "  --start            Start profiling."
-  echo "  --output|-o file   Save profile output to file. "
-  echo "                     (Default is /sdcard/Download/chrome-profile-results-*)"
-  echo "  --categories|-c C  Select categories to trace with comma-delimited wildcards."
-  echo "                     e.g. '*', 'cat1*,-cat1a'. Default is '*'."
-  echo "  --continuous       Using the trace buffer as a ring buffer, continuously"
-  echo "                     profile until stopped."
-  echo "  --stop             Stop profiling."
-  echo "  --download|-d      Download latest trace."
-  echo "  --time|-t N        Profile for N seconds and download the resulting trace."
-  echo "  --version|v N      Select among installed browsers."
-  echo "                     One of stable (default), beta, dev, build"
-  echo ""
-  echo "Profiling data is saved to the device."
-  exit 0
-}
-
-send_intent() {
-  local PACKAGE=$1
-  local INTENT=$2
-  shift
-  shift
-  adb shell am broadcast -a $PACKAGE.$INTENT $*
-}
-
-download_latest_trace() {
-  (adb logcat -d | grep -q "Logging performance trace to file") || {
-    echo "WARNING: Trace start marker not found. Is the correct version of Chrome running?"
-  }
-
-  local ITERATION=0
-  while true; do
-    # Chrome logs two different messages related to tracing:
-    #
-    # 1. "Logging performance trace to file [...]"
-    # 2. "Profiler finished. Results are in [...]"
-    #
-    # The first one is printed when tracing starts and the second one indicates
-    # that the trace file is ready to be downloaded.
-    #
-    # We have to look for both of these messages to make sure we get the results
-    # from the latest trace and that the trace file is complete. This is done by
-    # first looking for the last instance of the first message and then checking
-    # for the second message in the remaining part of the log.
-    TRACE_FILE=$(adb logcat -d | \
-        tac | \
-        grep --max-count=1 --before-context=100000 "Logging performance trace to file" | \
-        tac | \
-        grep "Profiler finished[.] Results are in " | \
-        perl -pi -e "s{.*/storage/emulated/.+/([^\r]+)[.].*}{/sdcard/Download/\\1}g")
-    if [ -n "$TRACE_FILE" ]; then
-      break
-    fi
-    if [ $ITERATION -eq 0 ]; then
-      echo -n "Waiting for Chrome to finish tracing..."
-    else
-      echo -n "."
-    fi
-    let ITERATION=ITERATION+1
-    if [ $ITERATION -eq 60 ]; then
-      echo "Timed out"
-      exit 1
-    fi
-    sleep 1
-  done
-
-  adb pull $TRACE_FILE 2> /dev/null
-  LOCAL_TRACE_FILE=$(basename $TRACE_FILE)
-  if [ ! -f "$LOCAL_TRACE_FILE" ]; then
-    echo "Unable to download trace file"
-    exit 1
-  fi
-}
-
-do_timed_capture() {
-  local PACKAGE=$1
-  local INTERVAL=$2
-  shift
-  shift
-  echo -n "Capturing trace..."
-  send_intent ${PACKAGE} "GPU_PROFILER_START" $* > /dev/null
-  sleep ${INTERVAL}
-  send_intent ${PACKAGE} "GPU_PROFILER_STOP" > /dev/null
-  echo "done"
-
-  echo -n "Downloading trace..."
-  sleep $[${INTERVAL} / 4 + 1]
-  download_latest_trace
-  echo "done"
-
-  echo "Trace written to ${PWD}/${LOCAL_TRACE_FILE}"
-}
-
-PACKAGE=${DEFAULT_PACKAGE:-com.android.chrome}
-
-while test -n "$1"; do
-  case "$1" in
-    -v|--version)
-      if [[ -z "$2" ]] ; then
-        usage
-      fi
-      shift
-      case "$1" in
-        stable) PACKAGE="com.android.chrome" ;;
-        beta) PACKAGE="com.chrome.beta" ;;
-        dev) PACKAGE="com.google.android.apps.chrome_dev" ;;
-        build) PACKAGE="com.google.android.apps.chrome" ;;
-        *) usage ;;
-      esac
-      ;;
-    --start) FUNCTION="GPU_PROFILER_START" ;;
-    --stop) FUNCTION="GPU_PROFILER_STOP" ;;
-    -o|--output)
-      if [ -z "$2" ] ; then
-        usage
-      fi
-      OUTPUT="-e file '$2'"
-      shift
-      ;;
-    -c|--categories)
-      if [ -z "$2" ]; then
-        usage
-      fi
-      CATEGORIES="-e categories '$2'"
-      shift
-      ;;
-    --continuous) CONTINUOUS="-e continuous ." ;;
-    -t|--time)
-      shift
-      if [ -z "$1" ] ; then
-        usage
-      fi
-      INTERVAL="$1"
-      ;;
-    -d|--download)
-      shift
-      download_latest_trace
-      echo "Trace written to ${PWD}/${LOCAL_TRACE_FILE}"
-      ;;
-    *) usage ;;
-  esac
-  shift
-done
-
-if [ -z "${INTERVAL}" ] ; then
-  if [ -z "${FUNCTION}" ] ; then
-    usage
-  else
-    send_intent ${PACKAGE} ${FUNCTION} ${OUTPUT} ${CATEGORIES} ${CONTINUOUS}
-  fi
-else
-  do_timed_capture ${PACKAGE} ${INTERVAL} ${CATEGORIES} ${CONTINUOUS}
-fi
-exit 0
+exec $(dirname $0)/adb_profile_chrome.py $@