commit 73fe0691a32a375799c5633099441bf0c7024c8b
Author: Joel Pittet <joel@pittet.ca>
Date:   Thu May 14 14:40:25 2015 -0700

    leaving variables for install and maintenance and other uses

diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 62c0b60..2382748 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1371,6 +1371,9 @@ function template_preprocess_page(&$variables) {
   $variables['base_path']         = base_path();
   $variables['front_page']        = \Drupal::url('<front>');
   $variables['language']          = $language_interface;
+  $variables['logo']              = theme_get_setting('logo.url');
+  $variables['site_name']         = (theme_get_setting('features.name') ? $site_config->get('name') : '');
+  $variables['site_slogan']       = (theme_get_setting('features.slogan') ? $site_config->get('slogan') : '');
 
   // An exception might be thrown.
   try {
diff --git a/core/modules/color/color.module b/core/modules/color/color.module
index 6fdaac5..8f615dd 100644
--- a/core/modules/color/color.module
+++ b/core/modules/color/color.module
@@ -106,6 +106,21 @@ function color_library_info_alter(&$libraries, $extension) {
 }
 
 /**
+ * Implements hook_preprocess_page().
+ *
+ * Replace the logo with the colored version if available.
+ */
+function color_preprocess_page(&$variables) {
+  $theme_key = \Drupal::theme()->getActiveTheme()->getName();
+
+  // Override logo.
+  $logo = \Drupal::config('color.theme.' . $theme_key)->get('logo');
+  if ($logo && $variables['logo'] && preg_match('!' . $theme_key . '/logo.svg$!', $variables['logo'])) {
+    $variables['logo'] = file_create_url($logo);
+  }
+}
+
+/**
  * Implements hook_block_view_BASE_BLOCK_ID_alter().
  */
 function color_block_view_system_branding_block_alter(array &$build, BlockPluginInterface $block) {
@@ -115,7 +130,7 @@ function color_block_view_system_branding_block_alter(array &$build, BlockPlugin
 /**
  * #pre_render callback: Sets color preset logo.
  */
-function color_block_view_pre_render(array $build) {
+function color_block_view_pre_render(array &$build) {
   $theme_key = \Drupal::theme()->getActiveTheme()->getName();
 
   // Override logo.
diff --git a/core/themes/seven/seven.theme b/core/themes/seven/seven.theme
index 15ac31e..6aa8baa 100644
--- a/core/themes/seven/seven.theme
+++ b/core/themes/seven/seven.theme
@@ -146,20 +146,16 @@ function seven_element_info_alter(&$type) {
  * Implements hook_preprocess_install_page().
  */
 function seven_preprocess_install_page(&$variables) {
-  $site_config = \Drupal::config('system.site');
   // Seven has custom styling for the install page.
   $variables['#attached']['library'][] = 'seven/install-page';
-  $variables['site_name'] = $site_config->get('name');
 }
 
 /**
  * Implements hook_preprocess_maintenance_page().
  */
 function seven_preprocess_maintenance_page(&$variables) {
-  $site_config = \Drupal::config('system.site');
   // Seven has custom styling for the maintenance page.
   $variables['#attached']['library'][] = 'seven/maintenance-page';
-  $variables['site_name'] = $site_config->get('name');
 }
 
 /**