Move timeline and importers to use telemetry.value.TraceValue

tools/telemetry/telemetry/core/tab_unittest.py

Index: tools/telemetry/telemetry/core/tab_unittest.py
diff --git a/tools/telemetry/telemetry/core/tab_unittest.py b/tools/telemetry/telemetry/core/tab_unittest.py
index 6f1389ade9be07baf89d742b5d73cf057c483cb9..97a548b5dbf7cc5ec148ade33e9a38729f556e8c 100644
--- a/tools/telemetry/telemetry/core/tab_unittest.py
+++ b/tools/telemetry/telemetry/core/tab_unittest.py
@@ -107,8 +107,8 @@ class TabTest(tab_test_case.TabTestCase):
     self._browser.StartTracing()
     self._tab.Highlight(bitmap.WEB_PAGE_TEST_ORANGE)
     self._tab.ClearHighlight(bitmap.WEB_PAGE_TEST_ORANGE)
-    trace_data = self._browser.StopTracing()
-    timeline_model = model.TimelineModel(trace_data)
+    trace_value = self._browser.StopTracing()
+    timeline_model = model.TimelineModel(trace_value)
     renderer_thread = timeline_model.GetRendererThreadFromTabId(
         self._tab.id)
     found_video_start_event = False
@@ -137,8 +137,8 @@ class TabTest(tab_test_case.TabTestCase):
     first_tab.ExecuteJavaScript('console.timeEnd("first-tab-marker");')
     second_tab.ExecuteJavaScript('console.time("second-tab-marker");')
     second_tab.ExecuteJavaScript('console.timeEnd("second-tab-marker");')
-    trace_data = self._browser.StopTracing()
-    timeline_model = model.TimelineModel(trace_data)
+    trace_value = self._browser.StopTracing()
+    timeline_model = model.TimelineModel(trace_value)
 
     # Assert that the renderer_thread of the first tab contains
     # 'first-tab-marker'.