[LongTasks] Change TaskAttributionTiming name to 'unknown'

At TPAC, we agreed that 'script' is confusing because it implies that
longtasks only measure script work. Thus, we decided to change the name
to 'unknown'. Also see https://github.com/w3c/longtasks/issues/47.

Change-Id: I5a0666d0fa078bfeac8ab6e8397b9b51aca3e833
Reviewed-on: https://chromium-review.googlesource.com/c/1336367Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608479}

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-attributes.html

@@ -32,7 +32,7 @@
                 'Exactly one attribution entry is expected');
             const attribution = longtask.attribution[0];
             assert_equals(attribution.entryType, 'taskattribution');
-            assert_equals(attribution.name, 'script');
+            assert_equals(attribution.name, 'unknown');
             assert_equals(attribution.duration, 0);
             assert_equals(attribution.startTime, 0);
             assert_equals(attribution.containerId, '');
@@ -52,4 +52,4 @@
 }, 'Performance longtask entries are observable.');
 </script>
 
-</body>
+</body>
\ No newline at end of file

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-childiframe-crossorigin.html

@@ -33,7 +33,7 @@
                 'Exactly one attribution entry is expected');
             const attribution = longtask.attribution[0];
             assert_equals(attribution.entryType, 'taskattribution');
-            assert_equals(attribution.name, 'script');
+            assert_equals(attribution.name, 'unknown');
             assert_equals(attribution.duration, 0);
             assert_equals(attribution.startTime, 0);
             assert_equals(attribution.containerId, 'child-iframe-id');

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-childiframe.html

@@ -38,7 +38,7 @@
                 'Exactly one attribution entry is expected');
             const attribution = longtask.attribution[0];
             assert_equals(attribution.entryType, 'taskattribution');
-            assert_equals(attribution.name, 'script');
+            assert_equals(attribution.name, 'unknown');
             assert_equals(attribution.duration, 0);
             assert_equals(attribution.startTime, 0);
             assert_equals(attribution.containerId, 'child-iframe-id');

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-externalscript.html

@@ -29,7 +29,7 @@
                 'Exactly one attribution entry is expected');
             const attribution = longtask.attribution[0];
             assert_equals(attribution.entryType, 'taskattribution');
-            assert_equals(attribution.name, 'script');
+            assert_equals(attribution.name, 'unknown');
             assert_equals(attribution.duration, 0);
             assert_equals(attribution.startTime, 0);
             assert_equals(attribution.containerId, '');
@@ -47,4 +47,4 @@
     }
 }, 'Performance longtask entries are observable.');
 </script>
-</body>
+</body>
\ No newline at end of file

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-parentiframe.html

@@ -15,7 +15,7 @@
     window.addEventListener('message', t.step_func(e => {
       assert_equals(e.data['entryType'], 'longtask');
       assert_equals(e.data['frame-attribution'], 'same-origin-ancestor');
-      assert_equals(e.data['task-attribution'], 'script');
+      assert_equals(e.data['task-attribution'], 'unknown');
       assert_equals(e.data['containerId'], '');
       assert_equals(e.data['containerName'], '');
       assert_equals(e.data['containerSrc'], '');

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-raf.html

@@ -29,7 +29,7 @@
                 'Exactly one attribution entry is expected');
             const attribution = longtask.attribution[0];
             assert_equals(attribution.entryType, 'taskattribution');
-            assert_equals(attribution.name, 'script');
+            assert_equals(attribution.name, 'unknown');
             assert_equals(attribution.duration, 0);
             assert_equals(attribution.startTime, 0);
             assert_equals(attribution.containerId, '');

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-sibling-iframe-crossorigin.html

@@ -15,7 +15,7 @@
     window.addEventListener('message', t.step_func(e => {
       assert_equals(e.data['entryType'], 'longtask');
       assert_equals(e.data['frame-attribution'], 'cross-origin-unreachable');
-      assert_equals(e.data['task-attribution'], 'script');
+      assert_equals(e.data['task-attribution'], 'unknown');
       assert_equals(e.data['containerId'], '');
       assert_equals(e.data['containerName'], '');
       assert_equals(e.data['containerSrc'], '');

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-sibling-iframe.html

@@ -15,7 +15,7 @@
     window.addEventListener('message', t.step_func(e => {
       assert_equals(e.data['entryType'], 'longtask');
       assert_equals(e.data['frame-attribution'], 'same-origin');
-      assert_equals(e.data['task-attribution'], 'script');
+      assert_equals(e.data['task-attribution'], 'unknown');
       assert_equals(e.data['containerId'], 'longtask-iframe-id');
       assert_equals(e.data['containerName'], 'longtask-iframe-name');
       assert_equals(e.data['containerSrc'], 'resources/subframe-with-longtask.html');

third_party/blink/renderer/core/timing/performance_long_task_timing.cc

@@ -48,7 +48,7 @@ PerformanceLongTaskTiming::PerformanceLongTaskTiming(
   } else {
     // Only one possible task type exists currently: "script".
     TaskAttributionTiming* attribution_entry =
-        TaskAttributionTiming::Create("script", "iframe", culprit_frame_src,
+        TaskAttributionTiming::Create("unknown", "iframe", culprit_frame_src,
                                       culprit_frame_id, culprit_frame_name);
     attribution_.push_back(*attribution_entry);
   }