tools/android/loading Move task creation to background and add dashboard

tools/android/loading/cloud/common/clovis_task.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.
 
 import base64
 import json
 import uuid
 
 class ClovisTask(object):
   """Generic task, generated by the AppEngine frontend and consumed by the
@@ skipping 12 matching lines @@
           'tag' key, a unique tag will be generated.
     """
     self._action = action
     self._action_params = action_params or {}
     self._backend_params = backend_params or {}
     # If no tag is specified, generate a unique tag.
     if not self._backend_params.get('tag'):
       self._backend_params.update({'tag': str(uuid.uuid1())})
 
   @classmethod
-  def FromJsonString(cls, json_dict):
-    """Loads a ClovisTask from a JSON string.
+  def FromJsonDict(cls, json_dict):
+    """Loads a ClovisTask from a JSON dictionary.
 
     Returns:
       ClovisTask: The task, or None if the string is invalid.
     """
     try:
-      data = json.loads(json_dict)
-      action = data['action']
-      action_params = data['action_params']
+      action = json_dict['action']
+      action_params = json_dict['action_params']
       # Vaidate the format.
       if action == 'trace':
         urls = action_params['urls']
         if (type(urls) is not list) or (len(urls) == 0):
           return None
       elif action == 'report':
         if not action_params.get('trace_bucket'):
           return None
       else:
         # When more actions are supported, check that they are valid here.
         return None
-      return cls(action, action_params, data.get('backend_params'))
+      return cls(action, action_params, json_dict.get('backend_params'))
     except Exception:
       return None
 
+  @classmethod
+  def FromJsonString(cls, json_string):
+    """Loads a ClovisTask from a JSON string.
+
+    Returns:
+      ClovisTask: The task, or None if the string is invalid.
+    """
+    try:
+      return cls.FromJsonDict(json.loads(json_string))
+    except Exception:
+      return None
+
   @classmethod
   def FromBase64(cls, base64_string):
     """Loads a ClovisTask from a base 64 string."""
     return ClovisTask.FromJsonString(base64.b64decode(base64_string))
 
+  def ToJsonDict(self):
+    """Returns the JSON representation of the task as a dictionary."""
+    return {'action': self._action, 'action_params': self._action_params,
+            'backend_params': self._backend_params}
+
   def ToJsonString(self):
-    """Returns the JSON representation of the task."""
-    task_dict = {'action': self._action, 'action_params': self._action_params,
-                 'backend_params': self._backend_params}
-    return json.dumps(task_dict)
+    """Returns the JSON representation of the task as a string."""
+    return json.dumps(self.ToJsonDict())
 
   def Action(self):
     return self._action
 
   def ActionParams(self):
     return self._action_params
 
   def BackendParams(self):
     return self._backend_params