[Telemetry] Fix 'important' field of certain Values being non-boolean

tools/perf/measurements/v8_gc_times.py

Index: tools/perf/measurements/v8_gc_times.py
diff --git a/tools/perf/measurements/v8_gc_times.py b/tools/perf/measurements/v8_gc_times.py
index 330939494d30bcbda7ce997d5dac28541728d852..9dc8b6f0bd6a0c902b00819464fd730302ad62c4 100644
--- a/tools/perf/measurements/v8_gc_times.py
+++ b/tools/perf/measurements/v8_gc_times.py
@@ -96,23 +96,24 @@ class V8GCTimes(page_test.PageTest):
       results.AddValue(scalar.ScalarValue(
           results.current_page, v8_event_stat.result_name, 'ms',
           v8_event_stat.thread_duration,
-          ('Total thread duration spent in %s' %
-           v8_event_stat.result_description)))
+          description=('Total thread duration spent in %s' %
+                       v8_event_stat.result_description)))
       results.AddValue(scalar.ScalarValue(results.current_page,
           '%s_outside_idle' % v8_event_stat.result_name, 'ms',
           v8_event_stat.thread_duration_outside_idle,
-          ('Total thread duration spent in %s outside of idle tasks' %
-           v8_event_stat.result_description)))
+          description=(
+              'Total thread duration spent in %s outside of idle tasks' %
+              v8_event_stat.result_description)))
       results.AddValue(scalar.ScalarValue(results.current_page,
           '%s_idle_deadline_overrun' % v8_event_stat.result_name, 'ms',
           v8_event_stat.idle_task_overrun_duration,
-          ('Total idle task deadline overrun for %s idle tasks'
-           % v8_event_stat.result_description)))
+          description=('Total idle task deadline overrun for %s idle tasks'
+                       % v8_event_stat.result_description)))
       results.AddValue(scalar.ScalarValue(results.current_page,
           '%s_percentage_idle' % v8_event_stat.result_name, 'idle%',
           v8_event_stat.percentage_thread_duration_during_idle,
-          ('Percentage of %s spent in idle time' %
-           v8_event_stat.result_description)))
+          description=('Percentage of %s spent in idle time' %
+                       v8_event_stat.result_description)))
 
     # Add total metrics.
     gc_total = sum(x.thread_duration for x in self._v8_event_stats)
@@ -125,20 +126,23 @@ class V8GCTimes(page_test.PageTest):
 
     results.AddValue(scalar.ScalarValue(results.current_page,
         'v8_gc_total', 'ms', gc_total,
-        'Total thread duration of all garbage collection events'))
+        description='Total thread duration of all garbage collection events'))
     results.AddValue(scalar.ScalarValue(results.current_page,
         'v8_gc_total_outside_idle', 'ms', gc_total_outside_idle,
-        'Total thread duration of all garbage collection events outside of '
-        'idle tasks'))
+        description=(
+            'Total thread duration of all garbage collection events outside of '
+            'idle tasks')))
     results.AddValue(scalar.ScalarValue(results.current_page,
         'v8_gc_total_idle_deadline_overrun', 'ms',
         gc_total_idle_deadline_overrun,
-        'Total idle task deadline overrun for all idle tasks garbage '
-        'collection events'))
+        description=(
+            'Total idle task deadline overrun for all idle tasks garbage '
+            'collection events')))
     results.AddValue(scalar.ScalarValue(results.current_page,
         'v8_gc_total_percentage_idle', 'idle%', gc_total_percentage_idle,
-        'Percentage of the thread duration of all garbage collection events '
-        'spent inside of idle tasks'))
+        description=(
+            'Percentage of the thread duration of all garbage collection '
+            'events spent inside of idle tasks')))
 
   def _AddCpuTimeStatsToResults(self, thread, results):
     if thread.toplevel_slices: