Add GetThreadToInteractionRecordsMapsFromModel method to timeline_interaction_record.

tools/telemetry/telemetry/web_perf/timeline_interaction_record.py

Index: tools/telemetry/telemetry/web_perf/timeline_interaction_record.py
diff --git a/tools/telemetry/telemetry/web_perf/timeline_interaction_record.py b/tools/telemetry/telemetry/web_perf/timeline_interaction_record.py
index 1879b0d365b27b977e72b864ad5b0658dc0c2c1a..ab8ef5ae156c905422bdfe93a5d41574f8819670 100644
--- a/tools/telemetry/telemetry/web_perf/timeline_interaction_record.py
+++ b/tools/telemetry/telemetry/web_perf/timeline_interaction_record.py
@@ -5,6 +5,7 @@
 import re
 
 from telemetry import decorators
+from telemetry.timeline import async_slice as async_slice_module
 import telemetry.timeline.bounds as timeline_bounds
 
 
@@ -30,13 +31,36 @@ class ThreadTimeRangeOverlappedException(Exception):
   with other events.
   """
 
+
 class NoThreadTimeDataException(ThreadTimeRangeOverlappedException):
   """Exception that can be thrown if there is not sufficient thread time data
   to compute the overlapped thread time range."""
 
+
 def IsTimelineInteractionRecord(event_name):
   return event_name.startswith('Interaction.')
 
+
+def _IsAsyncSlice(t):
+  return t == async_slice_module.AsyncSlice
+
+
+def GetThreadToInteractionRecordsMapsFromModel(timeline_model):
+  threads_to_records_map = {}
+  for thread in timeline_model.GetAllThreads():
+    for event in thread.async_slices:
+      if not IsTimelineInteractionRecord(event.name):
+        continue
+      assert event.start_thread
+      assert event.start_thread is event.end_thread
+      record_thread = event.start_thread
+      if record_thread not in threads_to_records_map:
+        threads_to_records_map[record_thread] = []
+      threads_to_records_map[record_thread].append(
+          TimelineInteractionRecord.FromAsyncEvent(event))
+  return threads_to_records_map
+
+
 def _AssertFlagsAreValid(flags):
   assert isinstance(flags, list)
   for f in flags:
@@ -44,6 +68,7 @@ def _AssertFlagsAreValid(flags):
       raise AssertionError(
           'Unrecognized flag for a timeline interaction record: %s' % f)
 
+
 def GetJavaScriptMarker(label, flags):
   """Computes the marker string of an interaction record.
 
@@ -117,6 +142,10 @@ class TimelineInteractionRecord(object):
     _AssertFlagsAreValid(self._flags)
 
   @property
+  def async_event(self):
+    return self._async_event
+
+  @property
   def label(self):
     return self._label