Adds a pref and a policy to decide if PDFs should always be opened externally.

chrome/browser/download/download_prefs_unittest.cc

 // Copyright 2015 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/download/download_prefs.h"
 
 #include "base/files/file_path.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/safe_browsing/file_type_policies.h"
 #include "chrome/test/base/testing_profile.h"
@@ skipping 99 matching lines @@
 
   EXPECT_TRUE(prefs.IsAutoOpenEnabledBasedOnExtension(
       base::FilePath(FILE_PATH_LITERAL("x.txt"))));
   EXPECT_TRUE(prefs.IsAutoOpenEnabledBasedOnExtension(
       base::FilePath(FILE_PATH_LITERAL("x.TXT"))));
   EXPECT_TRUE(prefs.IsAutoOpenEnabledBasedOnExtension(
       base::FilePath(FILE_PATH_LITERAL("x.foo"))));
   EXPECT_TRUE(prefs.IsAutoOpenEnabledBasedOnExtension(
       base::FilePath(FILE_PATH_LITERAL("x.Bar"))));
 }
+
+#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_MACOSX)
+TEST(DownloadPrefsTest, AlwaysOpenPdfExternally) {
+  content::TestBrowserThreadBundle threads_are_required_for_testing_profile;
+  TestingProfile profile;
+  profile.GetPrefs()->SetBoolean(prefs::kOpenPdfDownloadInSystemReader, false);
+  profile.GetPrefs()->SetBoolean(prefs::kPluginsAlwaysOpenPdfExternally, true);
+  DownloadPrefs prefs(&profile);
+  prefs.DisableAdobeVersionCheckForTests();
+
+  EXPECT_TRUE(prefs.ShouldOpenPdfInSystemReader());
+  EXPECT_TRUE(prefs.IsAutoOpenEnabledBasedOnExtension(
+      base::FilePath(FILE_PATH_LITERAL("doc.pdf"))));
+}
+#endif