Allow about:tracing Counters to be selected

chrome/browser/resources/tracing/timeline_test.html

Index: chrome/browser/resources/tracing/timeline_test.html
diff --git a/chrome/browser/resources/tracing/timeline_test.html b/chrome/browser/resources/tracing/timeline_test.html
index f6b718ce02f1f83dfcc9d9490996d34e87120894..0f1424fa85cb5e68af9d08aa8b1d222a2c4dcec8 100644
--- a/chrome/browser/resources/tracing/timeline_test.html
+++ b/chrome/browser/resources/tracing/timeline_test.html
@@ -53,10 +53,12 @@ found in the LICENSE file.
       model.importEvents(events);
       var timeline = new tracing.Timeline();
       timeline.model = model;
+      timeline.focusElement = timeline;
+      timeline.tabIndex = 0;
       document.body.appendChild(timeline);
     }
 
-    function testFindAllObjectsMatching() {
+    function testAddAllObjectsMatchingFilterToSelection() {
       var model = new tracing.TimelineModel();
       var p1 = model.getOrCreateProcess(1);
       var t1 = p1.getOrCreateThread(1);
@@ -74,19 +76,62 @@ found in the LICENSE file.
 
       var expected = [{slice: t1asg.slices[0].subSlices[0]},
                       {slice: t1.subRows[0][0]}];
-      var result = timeline.findAllObjectsMatchingFilter(new tracing.TimelineFilter('a'));
+      var result = new tracing.TimelineSelection();
+      timeline.addAllObjectsMatchingFilterToSelection(new tracing.TimelineFilter('a'), result);
       assertEquals(2, result.length);
       assertEquals(expected[0].slice, result[0].slice);
       assertEquals(expected[1].slice, result[1].slice);
 
       var expected = [{slice: t1asg.slices[1].subSlices[0]},
                       {slice: t1.subRows[0][1]}];
-      var result = timeline.findAllObjectsMatchingFilter(new tracing.TimelineFilter('b'));
+      var result = new tracing.TimelineSelection();
+      timeline.addAllObjectsMatchingFilterToSelection(new tracing.TimelineFilter('b'), result);
       assertEquals(2, result.length);
       assertEquals(expected[0].slice, result[0].slice);
       assertEquals(expected[1].slice, result[1].slice);
     }
 
+    function testSelectionObject() {
+      var model = new tracing.TimelineModel();
+      var p1 = model.getOrCreateProcess(1);
+      var t1 = p1.getOrCreateThread(1);
+      t1.subRows[0].push(new tracing.TimelineThreadSlice('a', 0, 1, {}, 3));
+      t1.subRows[0].push(new tracing.TimelineThreadSlice('a', 0, 5, {}, 1));
+
+      var sel = new tracing.TimelineSelection();
+      sel.addSlice({}, t1.subRows[0][0]);
+
+      assertEquals(1, sel.range.min);
+      assertEquals(4, sel.range.max);
+      assertEquals(t1.subRows[0][0], sel[0].slice);
+
+      sel.addSlice({}, t1.subRows[0][1]);
+      assertEquals(1, sel.range.min);
+      assertEquals(6, sel.range.max);
+      assertEquals(t1.subRows[0][1], sel[1].slice);
+
+      sel.clear();
+      assertEquals(0, sel.length);
+    }
+
+    function testShiftedSelection() {
+      var model = new tracing.TimelineModel();
+      var p1 = model.getOrCreateProcess(1);
+      var t1 = p1.getOrCreateThread(1);
+      t1.subRows[0].push(new tracing.TimelineThreadSlice('a', 0, 1, {}, 3));
+      t1.subRows[0].push(new tracing.TimelineThreadSlice('a', 0, 5, {}, 1));
+
+      var track = new tracing.TimelineSliceTrack();
+      track.slices = t1.subRows[0];
+
+      var sel = new tracing.TimelineSelection();
+      sel.addSlice(track, t1.subRows[0][0]);
+
+      var shifted = sel.getShiftedSelection(1);
+      assertEquals(1, shifted.length);
+      assertEquals(t1.subRows[0][1], shifted[0].slice);
+    }
+
   </script>
 </body>
 </html>