Add trace links to chrome://inspect (if chrome://inspect?tracing is used)

This patch adds trace links to chrome://inspect if you add the
"tracing" parameter to chrome://inspect. Clicking on the trace link
opens up chrome://tracing.

BUG=

Review URL: https://codereview.chromium.org/337803003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277781 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/inspect/inspect.js

@@ -330,16 +330,25 @@ function populateRemoteTargets(devices) {
           browserHeader.appendChild(newPage);
         }
 
-        if (queryParamsObject['browser-inspector']) {
+        var browserInspector;
+        var browserInspectorTitle;
+        if ('trace' in queryParamsObject || 'tracing' in queryParamsObject) {
+          browserInspector = 'chrome://tracing';
+          browserInspectorTitle = 'trace';
+        } else {
+          browserInspector = queryParamsObject['browser-inspector'];
+          browserInspectorTitle = 'inspect';
+        }
+        if (browserInspector) {
           var link = document.createElement('span');
           link.classList.add('action');
           link.setAttribute('tabindex', 1);
-          link.textContent = 'inspect';
+          link.textContent = browserInspectorTitle;
           browserHeader.appendChild(link);
           link.addEventListener(
               'click',
               sendCommand.bind(null, 'inspect-browser', browser.source,
-                  browser.id, queryParamsObject['browser-inspector']), false);
+                  browser.id, browserInspector), false);
         }
 
         pageList = document.createElement('div');