Tab Search benchmark: Turn back on smoke unittest

The CL also makes finding tab search target more robust by comparing
url scheme

Bug: 1099917
Change-Id: Idb0497176c1b3f5cb700362905932d029b6d6ad5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547425Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828985}

tools/perf/benchmarks/benchmark_smoke_unittest.py

@@ -103,7 +103,6 @@ _BLACK_LIST_TEST_NAMES = [
     'memory.long_running_idle_gmail_background_tbmv2',
     'tab_switching.typical_25',
     'UNSCHEDULED_oortonline_tbmv2',
-    'UNSCHEDULED_tab_search',  # crbug.com/1146335
     'webrtc',  # crbug.com/932036
     'v8.runtime_stats.top_25'  # Fails in Windows, crbug.com/1043048
 ]

tools/perf/page_sets/tab_search/tab_search_story.py

@@ -60,6 +60,8 @@ TOP_URL = [
     'whatsapp.com',
 ]
 
+TAB_SEARCH_URL = 'chrome://tab-search/'
+
 
 class TabSearchStory(page.Page):
   """Base class for tab search stories"""
@@ -87,16 +89,16 @@ class TabSearchStory(page.Page):
 
   def RunPageInteractions(self, action_runner):
     tabs = action_runner.tab.browser.tabs
-    tabs_len = len(tabs)
 
     # Open Tab Search bubble.
     action_runner.tab.browser.supports_inspecting_webui = True
     action_runner.tab.browser.ExecuteBrowserCommand('openTabSearch')
     # Wait for Tab Search bubble to be inspectable.
-    py_utils.WaitFor(lambda: len(tabs) > tabs_len, 10)
+    py_utils.WaitFor(
+        lambda: any([True for tab in tabs if tab.url == TAB_SEARCH_URL]), 10)
 
     # Wait for Tab Search bubble to load.
-    tab = tabs[-1]
+    tab = next(iter([tab for tab in tabs if tab.url == TAB_SEARCH_URL]))
     action_runner = ActionRunner(
         tab)  # Recreate action_runner for Tab Search bubble.
     tab.WaitForDocumentReadyStateToBeComplete()