[turbolizer] Set sequence and schedule on top of graphmultiview

Allows the use of PageUp and PageDown in sequence and schedule phases.

Since graphmultiview had a tabindex of 0, it was sitting on top of
sequence and schedule. This blocked the use of PageUp and PageDown
to scroll in these phases.

Bug: v8:7327
Change-Id: I4fc129cd9d5ea82e469cd4b67c12a455ec920317
Notry: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1914207Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64947}

tools/turbolizer/src/graphmultiview.ts

@@ -33,7 +33,7 @@ export class GraphMultiView extends View {
   createViewElement() {
     const pane = document.createElement("div");
     pane.setAttribute("id", multiviewID);
-    pane.setAttribute("tabindex", "0");
+    pane.setAttribute("tabindex", "1");
     pane.className = "viewpane";
     return pane;
   }

tools/turbolizer/src/schedule-view.ts

@@ -13,6 +13,7 @@ export class ScheduleView extends TextView {
     const pane = document.createElement('div');
     pane.setAttribute('id', "schedule");
     pane.classList.add("scrollable");
+    pane.setAttribute("tabindex", "0");
     return pane;
   }
 

tools/turbolizer/src/sequence-view.ts

@@ -14,6 +14,7 @@ export class SequenceView extends TextView {
     const pane = document.createElement('div');
     pane.setAttribute('id', "sequence");
     pane.classList.add("scrollable");
+    pane.setAttribute("tabindex", "0");
     return pane;
   }