Add responsiveness_metric for timeline_based_measurement

tools/telemetry/telemetry/core/timeline/thread.py

Index: tools/telemetry/telemetry/core/timeline/thread.py
diff --git a/tools/telemetry/telemetry/core/timeline/thread.py b/tools/telemetry/telemetry/core/timeline/thread.py
index 3b76397ed8bd97fee1619f70cb2c51d8d89c7b74..1d8ea82fa73c766a2449fb0b5796b3e62ace31f5 100644
--- a/tools/telemetry/telemetry/core/timeline/thread.py
+++ b/tools/telemetry/telemetry/core/timeline/thread.py
@@ -54,11 +54,18 @@ class Thread(event_container.TimelineEventContainer):
       for sub_slice in s.IterEventsInThisContainerRecrusively():
         yield sub_slice
 
-  def IterAllSlicesInRange(self, start, end):
+  def IterAllSlicesInTimeRange(self, start, end):
+    """Returns all slices with time ranges within start and end, inclusive. """
     for s in self.IterAllSlices():
       if s.start >= start and s.end <= end:
         yield s
 
+  def IterAllSlicesOverlappedWithTimeRange(self, start, end):
+    """Returns all slices whose time ranges overlap with range (start, end). """
+    for s in self.IterAllSlices():
+      if s.end > start and s.start < end:
+        yield s
+
   def IterAllSlicesOfName(self, name):
     for s in self.IterAllSlices():
       if s.name == name: