Ensure that --disable-extensions disables extension prefs from being enacted

chrome/browser/extensions/extension_prefs_unittest.cc

Index: chrome/browser/extensions/extension_prefs_unittest.cc
diff --git a/chrome/browser/extensions/extension_prefs_unittest.cc b/chrome/browser/extensions/extension_prefs_unittest.cc
index b536410f3a463ef3cc3d750a47f39124619aa8ce..7b6f9a1b0c6b75ec8323becc31186b2715651b04 100644
--- a/chrome/browser/extensions/extension_prefs_unittest.cc
+++ b/chrome/browser/extensions/extension_prefs_unittest.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/auto_reset.h"
+#include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
@@ -13,6 +15,7 @@
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/common/chrome_paths.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_permission_set.h"
 #include "content/browser/browser_thread.h"
@@ -1111,3 +1114,35 @@ class ExtensionPrefsSetExtensionControlledPref
 };
 TEST_F(ExtensionPrefsSetExtensionControlledPref,
     ExtensionPrefsSetExtensionControlledPref) {}
+
+// Tests that the switches::kDisableExtensions command-line flag prevents
+// extension controlled preferences from being enacted.
+class ExtensionPrefsDisableExtensions
+    : public ExtensionPrefsPreferencesBase {
+ public:
+  ExtensionPrefsDisableExtensions()
+      : iteration_(0),
+        cmd_auto_reset_(CommandLine::ForCurrentProcess(),
+                        *CommandLine::ForCurrentProcess()) {}
+  virtual ~ExtensionPrefsDisableExtensions() {}
+  virtual void Initialize() {
+    InstallExtControlledPref(ext1_, kPref1, Value::CreateStringValue("val1"));
+    // This becomes only active in the second verification phase.
+    CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kDisableExtensions);
+  }
+  virtual void Verify() {
+    std::string actual = prefs()->pref_service()->GetString(kPref1);
+    if (iteration_ == 0) {
+      EXPECT_EQ("val1", actual);
+      ++iteration_;
+    } else {
+      EXPECT_EQ(kDefaultPref1, actual);
+    }
+  }
+
+ private:
+  int iteration_;
+  AutoReset<CommandLine> cmd_auto_reset_;
+};
+TEST_F(ExtensionPrefsDisableExtensions, ExtensionPrefsDisableExtensions) {}