tools/android/loading Move LoadingTraceDatabase under cloud/

tools/android/loading/loading_trace_database.py

-# Copyright 2016 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.
-
-"""Represents a database of on-disk traces."""
-
-import json
-
-
-class LoadingTraceDatabase(object):
-  def __init__(self, traces_dict):
-    """traces_dict is a dictionary mapping filenames of traces to metadata
-       about those traces."""
-    self._traces_dict = traces_dict
-
-  def SetTrace(self, filename, trace_dict):
-    """Sets a mapping from |filename| to |trace_dict| into the database.
-    If there is an existing mapping for filename, it is replaced.
-    """
-    self._traces_dict[filename] = trace_dict
-
-  def GetTraceFilesForURL(self, url):
-    """Given a URL, returns the set of filenames of traces that were generated
-       for this URL."""
-    trace_files = [f for f in self._traces_dict.keys()
-        if self._traces_dict[f]["url"] == url]
-    return trace_files
-
-  def ToJsonDict(self):
-    """Returns a dict representing this instance."""
-    return self._traces_dict
-
-  def ToJsonString(self):
-    """Returns a string representing this instance."""
-    return json.dumps(self._traces_dict, indent=2)
-
-  def ToJsonFile(self, json_path):
-    """Saves a json file representing this instance."""
-    json_dict = self.ToJsonDict()
-    with open(json_path, 'w') as output_file:
-       json.dump(json_dict, output_file, indent=2)
-
-  @classmethod
-  def FromJsonDict(cls, json_dict):
-    """Returns an instance from a dict returned by ToJsonDict()."""
-    return LoadingTraceDatabase(json_dict)
-
-  @classmethod
-  def FromJsonString(cls, json_string):
-    """Returns an instance from a string returned by ToJsonString()."""
-    return LoadingTraceDatabase(json.loads(json_string))
-
-  @classmethod
-  def FromJsonFile(cls, json_path):
-    """Returns an instance from a json file saved by ToJsonFile()."""
-    with open(json_path) as input_file:
-      return cls.FromJsonDict(json.load(input_file))