Do not show pinned tabs on multiple instances

chrome/browser/ui/startup/startup_tab_provider_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/startup/startup_tab_provider.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/url_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
@@ skipping 179 matching lines @@
 
   ASSERT_TRUE(output.empty());
 }
 
 TEST(StartupTabProviderTest, CheckPinnedTabPolicy) {
   StartupTabs pinned = {StartupTab(GURL("https://www.google.com"), true)};
   SessionStartupPref pref_default(SessionStartupPref::Type::DEFAULT);
   SessionStartupPref pref_urls(SessionStartupPref::Type::URLS);
 
   StartupTabs output =
-      StartupTabProviderImpl::CheckPinnedTabPolicy(pref_default, pinned);
+      StartupTabProviderImpl::CheckPinnedTabPolicy(pref_default, pinned, false);
 
   ASSERT_EQ(1U, output.size());
   EXPECT_EQ("www.google.com", output[0].url.host());
 
-  output = StartupTabProviderImpl::CheckPinnedTabPolicy(pref_urls, pinned);
+  output = StartupTabProviderImpl::CheckPinnedTabPolicy(pref_urls, pinned, false);
 
   ASSERT_EQ(1U, output.size());
   EXPECT_EQ("www.google.com", output[0].url.host());
 }
 
 TEST(StartupTabProviderTest, CheckPinnedTabPolicy_Negative) {
   StartupTabs pinned = {StartupTab(GURL("https://www.google.com"), true)};
   SessionStartupPref pref_last(SessionStartupPref::Type::LAST);
+  SessionStartupPref pref_default(SessionStartupPref::Type::DEFAULT);
 
+  // Session restore preference should block reading pinned tabs.
   StartupTabs output =
-      StartupTabProviderImpl::CheckPinnedTabPolicy(pref_last, pinned);
+      StartupTabProviderImpl::CheckPinnedTabPolicy(pref_last, pinned, false);
+
+  ASSERT_TRUE(output.empty());
+
+  // Pinned tabs are not added when this profile already has a nonempty tabbed
+  // browser open.
+  output =
+      StartupTabProviderImpl::CheckPinnedTabPolicy(pref_default, pinned, true);
 
   ASSERT_TRUE(output.empty());
 }
 
 TEST(StartupTabProviderTest, CheckPreferencesTabPolicy) {
   SessionStartupPref pref(SessionStartupPref::Type::URLS);
   pref.urls = {GURL(base::ASCIIToUTF16("https://www.google.com"))};
 
   StartupTabs output =
       StartupTabProviderImpl::CheckPreferencesTabPolicy(pref, false);
@@ skipping 46 matching lines @@
 }
 
 TEST(StartupTabProviderTest, CheckNewTabPageTabPolicy_Negative) {
   SessionStartupPref pref_last(SessionStartupPref::Type::LAST);
 
   StartupTabs output =
       StartupTabProviderImpl::CheckNewTabPageTabPolicy(pref_last);
 
   ASSERT_TRUE(output.empty());
 }