DevTools: Support grouping by Product in performance tree views.

third_party/WebKit/Source/devtools/front_end/main/Main.js

Index: third_party/WebKit/Source/devtools/front_end/main/Main.js
diff --git a/third_party/WebKit/Source/devtools/front_end/main/Main.js b/third_party/WebKit/Source/devtools/front_end/main/Main.js
index f8360c6e9ea0a8e43d53d5c345ff94bcfe49d81b..3fdb7a4ac0e6237592092509dc682fba3c92f018 100644
--- a/third_party/WebKit/Source/devtools/front_end/main/Main.js
+++ b/third_party/WebKit/Source/devtools/front_end/main/Main.js
@@ -109,7 +109,7 @@ Main.Main = class {
     Runtime.experiments.register('terminalInDrawer', 'Terminal in drawer', true);
 
     // Timeline
-    Runtime.experiments.register('timelineColorByProduct', 'Timeline: color by product', true);
+    Runtime.experiments.register('timelineColorByProduct', 'Timeline: group and color by product', true);
     Runtime.experiments.register('timelineEventInitiators', 'Timeline: event initiators');
     Runtime.experiments.register('timelineFlowEvents', 'Timeline: flow events', true);
     Runtime.experiments.register('timelineInvalidationTracking', 'Timeline: invalidation tracking', true);
@@ -136,6 +136,8 @@ Main.Main = class {
         Runtime.experiments.enableForTest('changesDrawer');
       if (testPath.indexOf('sass/') !== -1)
         Runtime.experiments.enableForTest('liveSASS');
+      if (testPath.indexOf('tracing/') !== -1)
+        Runtime.experiments.enableForTest('timelineColorByProduct');

[caseq, 2017/05/09 01:48:32]

Let's rather do this in tests, use experiment.enableForTest() from an
initialize_Foo() function.

[alph, 2017/05/09 02:00:14]

Done.

     }
 
     Runtime.experiments.setDefaultExperiments(['continueToLocationMarkers', 'autoAttachToCrossProcessSubframes']);