Tab Search: setup webui test

Related CL:
https://chrome-internal-review.googlesource.com/c/chrome/browser/resources/tab_search/+/3164617

Bug: 1099917
Change-Id: Ie9add185ce58b7055f8febb119ba18ec31c2917c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298282
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789739}

chrome/browser/ui/webui/tab_search/tab_search_ui.cc

@@ -27,7 +27,8 @@ constexpr char kGeneratedPath[] =
 #endif  // BUILDFLAG(ENABLE_TAB_SEARCH)
 
 TabSearchUI::TabSearchUI(content::WebUI* web_ui)
-    : ui::MojoWebUIController(web_ui) {
+    : ui::MojoWebUIController(web_ui,
+                              true /* Needed for webui browser tests */) {
 #if BUILDFLAG(ENABLE_TAB_SEARCH)
   content::WebUIDataSource* source =
       content::WebUIDataSource::Create(chrome::kChromeUITabSearchHost);

chrome/test/data/webui/BUILD.gn

@@ -168,6 +168,9 @@ if (include_js_tests) {
     if (enable_print_preview) {
       sources += [ "print_preview/print_preview_ui_browsertest.js" ]
     }
+    if (enable_tab_search) {
+      sources += [ "tab_search/test/tab_search_browsertest.js" ]
+    }
     if (enable_webui_tab_strip) {
       sources += [ "tab_strip/tab_strip_browsertest.js" ]
     }
@@ -374,6 +377,9 @@ group("closure_compile") {
 
     # TODO(crbug.com/1000989): Add page specific targets here.
   ]
+  if (enable_tab_search) {
+    deps += [ "tab_search/test:closure_compile" ]
+  }
 }
 
 js_type_check("closure_compile_local") {