Timeline service protocol support with Observatory UI

runtime/observatory/observatory_sources.gypi

Index: runtime/observatory/observatory_sources.gypi
diff --git a/runtime/observatory/observatory_sources.gypi b/runtime/observatory/observatory_sources.gypi
index 630ca4c92bb9a7c0095398f0f8e1c90a82178764..14c1ac213182a52f335fd4a356b82ba0264c3c16 100644
--- a/runtime/observatory/observatory_sources.gypi
+++ b/runtime/observatory/observatory_sources.gypi
@@ -134,6 +134,8 @@
     'lib/src/elements/service_view.html',
     'lib/src/elements/sliding_checkbox.dart',
     'lib/src/elements/sliding_checkbox.html',
+    'lib/src/elements/timeline_page.dart',
+    'lib/src/elements/timeline_page.html',
     'lib/src/elements/view_footer.dart',
     'lib/src/elements/view_footer.html',
     'lib/src/elements/vm_connect.dart',
@@ -152,5 +154,8 @@
     'web/index.html',
     'web/main.dart',
     'web/favicon.ico',
+    'web/third_party/trace_viewer_full.html',
+    'web/timeline.js',
+    'web/timeline.html',
   ],
 }