tools/android/loading: Archive tracks in LoadingTrace.

tools/android/loading/loading_trace.py

Index: tools/android/loading/loading_trace.py
diff --git a/tools/android/loading/loading_trace.py b/tools/android/loading/loading_trace.py
new file mode 100644
index 0000000000000000000000000000000000000000..720fa1d17fce6361613452b6a57f8d295cf3cc45
--- /dev/null
+++ b/tools/android/loading/loading_trace.py
@@ -0,0 +1,55 @@
+# Copyright (c) 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 the trace of a page load."""
+
+import page_track
+import request_track
+import tracing
+
+class LoadingTrace(object):
+  """Represents the trace of a page load."""
+  _URL_KEY = 'url'
+  _METADATA_KEY = 'metadata'
+  _PAGE_KEY = 'page_track'
+  _REQUEST_KEY = 'request_track'
+  _TRACING_KEY = 'tracing_track'
+
+  def __init__(self, url, metadata, page, request, tracing_track):
+    """Initializes a loading trace instance.
+
+    Args:
+      url: (str) URL that has been loaded
+      metadata: (dict) Metadata associated with the load.
+      page: (PageTrack) instance of PageTrack.
+      request: (RequestTrack) instance of RequestTrack.
+      tracing_track: (TracingTrack) instance of TracingTrack.
+    """
+    self.url = url
+    self.metadata = metadata
+    self.page_track = page
+    self.request_track = request
+    self.tracing_track = tracing_track
+
+  def ToJsonDict(self):
+    """Returns a dictionary representing this instance."""
+    result = {self._URL_KEY: self.url, self._METADATA_KEY: self.metadata,
+              self._PAGE_KEY: self.page_track.ToJsonDict(),
+              self._REQUEST_KEY: self.request_track.ToJsonDict(),
+              self._TRACING_KEY: self.tracing_track.ToJsonDict()}
+    return result
+
+  @classmethod
+  def FromJsonDict(cls, json_dict):
+    """Returns an instance from a dictionary returned by ToJsonDict()."""
+    keys = (cls._URL_KEY, cls._METADATA_KEY, cls._PAGE_KEY, cls._REQUEST_KEY,
+            cls._TRACING_KEY)
+    assert all(key in json_dict for key in keys)
+    page = page_track.PageTrack.FromJsonDict(json_dict[cls._PAGE_KEY])
+    request = request_track.RequestTrack.FromJsonDict(
+        json_dict[cls._REQUEST_KEY])
+    tracing_track = tracing.TracingTrack.FromJsonDict(
+        json_dict[cls._TRACING_KEY])
+    return LoadingTrace(json_dict[cls._URL_KEY], json_dict[cls._METADATA_KEY],
+                        page, request, tracing_track)