[OS X] Wire up --use-mock-keychain command line flag to encryptor module

components/encryptor/encryptor_mac.mm

 // Copyright 2014 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 "components/encryptor/encryptor.h"
 
 #include <CommonCrypto/CommonCryptor.h>  // for kCCBlockSizeAES128
 
+#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/encryptor/encryptor_password_mac.h"
+#include "components/encryptor/encryptor_switches.h"
 #include "crypto/apple_keychain.h"
 #include "crypto/encryptor.h"
 #include "crypto/symmetric_key.h"
 
 using crypto::AppleKeychain;
 
 namespace {
 
 // Salt for Symmetric key derivation.
 const char kSalt[] = "saltysalt";
@@ skipping 10 matching lines @@
 // Prefix for cypher text returned by current encryption version.  We prefix
 // the cypher text with this string so that future data migration can detect
 // this and migrate to different encryption without data loss.
 const char kEncryptionVersionPrefix[] = "v10";
 
 // Generates a newly allocated SymmetricKey object based on the password found
 // in the Keychain.  The generated key is for AES encryption.  Ownership of the
 // key is passed to the caller.  Returns NULL key in the case password access
 // is denied or key generation error occurs.
 crypto::SymmetricKey* GetEncryptionKey() {
+  static bool mock_keychain_command_line_flag =
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          encryptor::switches::kUseMockKeychain);
 
   std::string password;
-  if (use_mock_keychain) {
+  if (use_mock_keychain || mock_keychain_command_line_flag) {
     password = "mock_password";
   } else {
     AppleKeychain keychain;
     EncryptorPassword encryptor_password(keychain);
     password = encryptor_password.GetEncryptorPassword();
   }
 
   if (password.empty())
     return NULL;
 
@@ skipping 85 matching lines @@
   if (!encryptor.Decrypt(raw_ciphertext, plaintext))
     return false;
 
   return true;
 }
 
 void Encryptor::UseMockKeychain(bool use_mock) {
   use_mock_keychain = use_mock;
 }