Remove //tools/profile_chrome from Chromium repo

tools/profile_chrome/systrace_controller.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 threading
-import zlib
-
-from devil.utils import cmd_helper
-
-from profile_chrome import controllers
-from profile_chrome import util
-
-
-_SYSTRACE_OPTIONS = [
-    # Compress the trace before sending it over USB.
-    '-z',
-    # Use a large trace buffer to increase the polling interval.
-    '-b', '16384'
-]
-
-# Interval in seconds for sampling systrace data.
-_SYSTRACE_INTERVAL = 15
-
-_TRACING_ON_PATH = '/sys/kernel/debug/tracing/tracing_on'
-
-
-class SystraceController(controllers.BaseController):
-  def __init__(self, device, categories, ring_buffer):
-    controllers.BaseController.__init__(self)
-    self._device = device
-    self._categories = categories
-    self._ring_buffer = ring_buffer
-    self._done = threading.Event()
-    self._thread = None
-    self._trace_data = None
-
-  def __repr__(self):
-    return 'systrace'
-
-  @staticmethod
-  def GetCategories(device):
-    return device.RunShellCommand('atrace --list_categories')
-
-  def StartTracing(self, _):
-    self._thread = threading.Thread(target=self._CollectData)
-    self._thread.start()
-
-  def StopTracing(self):
-    self._done.set()
-
-  def PullTrace(self):
-    self._thread.join()
-    self._thread = None
-    if self._trace_data:
-      output_name = 'systrace-%s' % util.GetTraceTimestamp()
-      with open(output_name, 'w') as out:
-        out.write(self._trace_data)
-      return output_name
-
-  def IsTracingOn(self):
-    result = self._RunAdbShellCommand(['cat', _TRACING_ON_PATH])
-    return result.strip() == '1'
-
-  def _RunAdbShellCommand(self, command):
-    # We use a separate interface to adb because the one from AndroidCommands
-    # isn't re-entrant.
-    # TODO(jbudorick) Look at providing a way to unhandroll this once the
-    #                 adb rewrite has fully landed.
-    device_param = (['-s', str(self._device)] if str(self._device) else [])
-    cmd = ['adb'] + device_param + ['shell'] + command
-    return cmd_helper.GetCmdOutput(cmd)
-
-  def _RunATraceCommand(self, command):
-    cmd = ['atrace', '--%s' % command] + _SYSTRACE_OPTIONS + self._categories
-    return self._RunAdbShellCommand(cmd)
-
-  def _ForceStopAtrace(self):
-    # atrace on pre-M Android devices cannot be stopped asynchronously
-    # correctly. Use synchronous mode to force stop.
-    cmd = ['atrace', '-t', '0']
-    return self._RunAdbShellCommand(cmd)
-
-  def _CollectData(self):
-    trace_data = []
-    self._RunATraceCommand('async_start')
-    try:
-      while not self._done.is_set():
-        self._done.wait(_SYSTRACE_INTERVAL)
-        if not self._ring_buffer or self._done.is_set():
-          trace_data.append(
-              self._DecodeTraceData(self._RunATraceCommand('async_dump')))
-    finally:
-      trace_data.append(
-          self._DecodeTraceData(self._RunATraceCommand('async_stop')))
-      if self.IsTracingOn():
-        self._ForceStopAtrace()
-    self._trace_data = ''.join([zlib.decompress(d) for d in trace_data])
-
-  @staticmethod
-  def _DecodeTraceData(trace_data):
-    try:
-      trace_start = trace_data.index('TRACE:')
-    except ValueError:
-      raise RuntimeError('Systrace start marker not found')
-    trace_data = trace_data[trace_start + 6:]
-
-    # Collapse CRLFs that are added by adb shell.
-    if trace_data.startswith('\r\n'):
-      trace_data = trace_data.replace('\r\n', '\n')
-
-    # Skip the initial newline.
-    return trace_data[1:]