Introduce FastShowPickler which will be used for app list cold start.

chrome/browser/ui/app_list/chrome_app_list_unit_tests.cc

Index: chrome/browser/ui/app_list/chrome_app_list_unit_tests.cc
diff --git a/chrome/browser/ui/autofill/autofill_dialog_models_unittest.cc b/chrome/browser/ui/app_list/chrome_app_list_unit_tests.cc
similarity index 57%
copy from chrome/browser/ui/autofill/autofill_dialog_models_unittest.cc
copy to chrome/browser/ui/app_list/chrome_app_list_unit_tests.cc
index b9a90dea36a0e3f01156591ab2cee4e0cd1f1a3f..70a1bcc73557ea3bdbcb8a1d9daf0fdd804e95b8 100644
--- a/chrome/browser/ui/autofill/autofill_dialog_models_unittest.cc
+++ b/chrome/browser/ui/app_list/chrome_app_list_unit_tests.cc
@@ -2,10 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/ui/autofill/autofill_dialog_models.h"
-#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-namespace autofill {
-
-}  // namespace autofill
+int main(int argc, char** argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}