trace-explorer: add to default layout

Fixes: #80

The following commit adds the `Trace Explorer` to the default layout of
the application. This will make the view more discoverable and
accessible to end-users.

Signed-off-by: vince-fugnitto <vincent.fugnitto@ericsson.com>

viewer-prototype/src/browser/trace-explorer/trace-explorer-contribution.ts

@@ -1,7 +1,9 @@
 import { AbstractViewContribution } from "@theia/core/lib/browser/shell/view-contribution";
 import { TraceExplorerWidget, TRACE_EXPLORER_ID, TRACE_EXPLORER_LABEL } from "./trace-explorer-widget";
+import { FrontendApplicationContribution, FrontendApplication } from "@theia/core/lib/browser";
+
+export class TraceExplorerContribution extends AbstractViewContribution<TraceExplorerWidget> implements FrontendApplicationContribution {
 
-export class TraceExplorerContribution extends AbstractViewContribution<TraceExplorerWidget> {
     constructor() {
         super({
             widgetId: TRACE_EXPLORER_ID,
@@ -12,4 +14,9 @@ export class TraceExplorerContribution extends AbstractViewContribution<TraceExp
             toggleCommandId: 'trace-explorer:toggle'
         });
     }
+
+    async initializeLayout(_app: FrontendApplication): Promise<void> {
+        await this.openView({ activate: false });
+    }
+
 }

viewer-prototype/src/browser/trace-viewer/trace-viewer-frontend-module.ts

@@ -44,7 +44,7 @@ export default new ContainerModule(bind => {
 
     bindViewContribution(bind, TraceExplorerContribution);
     bind(TraceExplorerWidget).toSelf();
-    // bind(FrontendApplicationContribution).toService(TraceExplorerContribution);
+    bind(FrontendApplicationContribution).toService(TraceExplorerContribution);
     bind(WidgetFactory).toDynamicValue(context => ({
         id: TRACE_EXPLORER_ID,
         createWidget: () => context.container.get<TraceExplorerWidget>(TraceExplorerWidget)