[pinpoint] Add ReadGraphJsonValue.

dashboard/dashboard/pinpoint/models/quest/find_isolate.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.
 
 from dashboard.pinpoint.models import isolate
 from dashboard.pinpoint.models.quest import execution
 from dashboard.pinpoint.models.quest import quest
 from dashboard.services import buildbucket_service
 
 
 BUCKET = 'master.tryserver.chromium.perf'
 
 
 class BuildError(Exception):
   """Raised when the build fails."""
 
 
 class FindIsolate(quest.Quest):
 
-  def __init__(self, configuration):
+  def __init__(self, configuration, target):
     self._builder_name = _BuilderNameForConfiguration(configuration)
+    self._target = target
 
   def __eq__(self, other):
     return (isinstance(other, type(self)) and
             self._builder_name == other._builder_name)
 
   def __str__(self):
     return 'Build on ' + self._builder_name
 
   @property
   def retry_count(self):
     return 1
 
   def Start(self, change):
-    return _FindIsolateExecution(self._builder_name, change)
+    return _FindIsolateExecution(self._builder_name, self._target, change)
 
 
 class _FindIsolateExecution(execution.Execution):
 
-  def __init__(self, builder_name, change):
+  def __init__(self, builder_name, target, change):
     super(_FindIsolateExecution, self).__init__()
     self._builder_name = builder_name
+    self._target = target
     self._change = change
     self._build = None
 
   def _Poll(self):
     # Look for the .isolate in our cache.
-    # TODO: Support other isolate targets.
-    target = 'telemetry_perf_tests'
     try:
-      isolate_hash = isolate.Get(self._builder_name, self._change, target)
+      isolate_hash = isolate.Get(self._builder_name, self._change, self._target)
     except KeyError:
       isolate_hash = None
 
     if isolate_hash:
       self._Complete(result_arguments={'isolate_hash': isolate_hash})
       return
 
     # Check the status of a previously requested build.
     if self._build:
       status = buildbucket_service.GetJobStatus(self._build)
@@ skipping 64 matching lines @@
     # https://github.com/catapult-project/catapult/issues/3599
     parameters['properties'].update({
         'patch_storage': 'rietveld',
         'rietveld': change.patch.server,
         'issue': change.patch.issue,
         'patchset': change.patch.patchset,
     })
 
   # TODO: Look up Buildbucket bucket from builder_name.
   return buildbucket_service.Put(BUCKET, parameters)