Allow multiple logging::LogMessage{Handler,Listener}s

chrome/installer/util/installation_validator_unittest.cc

 // Copyright (c) 2012 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 <stddef.h>
 
 #include <map>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 264 matching lines @@
       Vehicle vehicle,
       FakeProductState* state);
   static void MakeMachineState(
       InstallationValidator::InstallationType inst_type,
       Level install_level,
       Channel channel,
       Vehicle vehicle,
       FakeInstallationState* state);
   void TearDown() override;
 
-  static logging::LogMessageHandlerFunction old_log_message_handler_;
   static ValidationErrorRecipient* validation_error_recipient_;
   static InstallationTypeToModifiers* type_to_modifiers_;
 };
 
 // static
-logging::LogMessageHandlerFunction
-    InstallationValidatorTest::old_log_message_handler_ = NULL;
-
-// static
 InstallationValidatorTest::ValidationErrorRecipient*
     InstallationValidatorTest::validation_error_recipient_ = NULL;
 
 // static
 InstallationValidatorTest::InstallationTypeToModifiers*
     InstallationValidatorTest::type_to_modifiers_ = NULL;
 
 // static
 int InstallationValidatorTest::GetChannelModifiers(
     InstallationValidator::InstallationType type) {
   DCHECK(type_to_modifiers_);
   DCHECK(type_to_modifiers_->find(type) != type_to_modifiers_->end());
 
   return (*type_to_modifiers_)[type];
 }
 
 // static
 void InstallationValidatorTest::SetUpTestCase() {
   DCHECK(type_to_modifiers_ == NULL);
-  old_log_message_handler_ = logging::GetLogMessageHandler();
-  logging::SetLogMessageHandler(&HandleLogMessage);
+  logging::PushLogMessageHandler(HandleLogMessage);
 
   type_to_modifiers_ = new InstallationTypeToModifiers();
   InstallationTypeToModifiers& ttm = *type_to_modifiers_;
   ttm[InstallationValidator::NO_PRODUCTS] = 0;
   ttm[InstallationValidator::CHROME_SINGLE] = 0;
   ttm[InstallationValidator::CHROME_MULTI] = CM_MULTI | CM_CHROME;
   ttm[InstallationValidator::CHROME_FRAME_SINGLE] = 0;
   ttm[InstallationValidator::CHROME_FRAME_SINGLE_CHROME_SINGLE] = 0;
   ttm[InstallationValidator::CHROME_FRAME_SINGLE_CHROME_MULTI] =
       CM_MULTI | CM_CHROME;
   ttm[InstallationValidator::CHROME_FRAME_MULTI] = CM_MULTI | CM_CHROME_FRAME;
   ttm[InstallationValidator::CHROME_FRAME_MULTI_CHROME_MULTI] =
       CM_MULTI | CM_CHROME_FRAME | CM_CHROME;
 }
 
 // static
 void InstallationValidatorTest::TearDownTestCase() {
-  logging::SetLogMessageHandler(old_log_message_handler_);
-  old_log_message_handler_ = NULL;
+  logging::PopLogMessageHandler(HandleLogMessage);
 
   delete type_to_modifiers_;
   type_to_modifiers_ = NULL;
 }
 
 // static
 bool InstallationValidatorTest::HandleLogMessage(int severity,
                                                  const char* file,
                                                  int line,
                                                  size_t message_start,
                                                  const std::string& str) {
   // All validation failures result in LOG(ERROR)
   if (severity == logging::LOG_ERROR && !str.empty()) {
     // Remove the trailing newline, if present.
     size_t message_length = str.size() - message_start;
     if (*str.rbegin() == '\n')
       --message_length;
     if (validation_error_recipient_ != NULL) {
       validation_error_recipient_->ReceiveValidationError(
           file, line, str.substr(message_start, message_length).c_str());
     } else {
       // Fail the test if an error wasn't handled.
       ADD_FAILURE_AT(file, line)
           << base::StringPiece(str.c_str() + message_start, message_length);
     }
     return true;
   }
 
-  if (old_log_message_handler_ != NULL)
-    return (old_log_message_handler_)(severity, file, line, message_start, str);
-
   return false;
 }
 
 // static
 void InstallationValidatorTest::set_validation_error_recipient(
     ValidationErrorRecipient* recipient) {
   validation_error_recipient_ = recipient;
 }
 
 // static
@@ skipping 106 matching lines @@
     AllValidInstallations,
     InstallationValidatorTest,
     Values(InstallationValidator::NO_PRODUCTS,
            InstallationValidator::CHROME_SINGLE,
            InstallationValidator::CHROME_MULTI,
            InstallationValidator::CHROME_FRAME_SINGLE,
            InstallationValidator::CHROME_FRAME_SINGLE_CHROME_SINGLE,
            InstallationValidator::CHROME_FRAME_SINGLE_CHROME_MULTI,
            InstallationValidator::CHROME_FRAME_MULTI,
            InstallationValidator::CHROME_FRAME_MULTI_CHROME_MULTI));