diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/BreakpointsTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/BreakpointsTest.php
new file mode 100644
index 0000000..08bbedd
--- /dev/null
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/BreakpointsTest.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\system\Tests\Common\BreakpointsTest.
+ */
+
+namespace Drupal\system\Tests\Common;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests system_breakpoint_list().
+ */
+class BreakpointsTest extends WebTestBase {
+  public static function getInfo() {
+    return array(
+      'name' => 'Breakpoints',
+      'description' => 'Tests retrieving breakpoints from theme info.',
+      'group' => 'Common',
+    );
+  }
+
+  /**
+   * Tests retrieving breakpoints from theme info.
+   */
+  function testBreakpoints() {
+    $expected = array(
+      'mobile' => '(min-width: 0em)',
+      'wide' => 'screen and (min-width: 40em)',
+    );
+    // theme_enable is needed so config gets loaded.
+    theme_enable(array('seven'));
+    $this->assertEqual(system_breakpoint_list('seven'), $expected);
+  }
+}
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 922b8a7..4f04a24 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -3126,6 +3126,27 @@ function system_region_list($theme_key, $show = REGIONS_ALL) {
 }
 
 /**
+ * Get a list of available breakpoints from a specified theme.
+ *
+ * @param $theme_key
+ *   The name of a theme.
+ * @return
+ *   An array of breakpoints in the form $breakpoint['name'] = 'media query'.
+ */
+function system_breakpoint_list($theme_key) {
+  $themes = list_themes();
+  if (!isset($themes[$theme_key])) {
+    return array();
+  }
+
+  $config = config($theme_key . '.breakpoints');
+  if ($config) {
+    return $config->get();
+  }
+  return array();
+}
+
+/**
  * Implements hook_system_info_alter().
  */
 function system_system_info_alter(&$info, $file, $type) {
diff --git a/core/themes/bartik/config/bartik.breakpoints.yml b/core/themes/bartik/config/bartik.breakpoints.yml
new file mode 100644
index 0000000..9eb9cb2
--- /dev/null
+++ b/core/themes/bartik/config/bartik.breakpoints.yml
@@ -0,0 +1,3 @@
+mobile: '(min-width: 0px)'
+narrow: 'all and (min-width: 560px) and (max-width:850px)'
+wide: 'all and (min-width: 851px)'
diff --git a/core/themes/seven/config/seven.breakpoints.yml b/core/themes/seven/config/seven.breakpoints.yml
new file mode 100644
index 0000000..9fd82d7
--- /dev/null
+++ b/core/themes/seven/config/seven.breakpoints.yml
@@ -0,0 +1,2 @@
+mobile: '(min-width: 0em)'
+wide: 'screen and (min-width: 40em)'
diff --git a/core/themes/seven/seven.info b/core/themes/seven/seven.info
index 969f749..c2782c9 100644
--- a/core/themes/seven/seven.info
+++ b/core/themes/seven/seven.info
@@ -3,9 +3,12 @@ description = A simple one-column, tableless, fluid width administration theme.
 package = Core
 version = VERSION
 core = 8.x
+
 stylesheets[screen][] = reset.css
 stylesheets[screen][] = style.css
+
 settings[shortcut_module_link] = 1
+
 regions[content] = Content
 regions[help] = Help
 regions[page_top] = Page top
diff --git a/core/themes/stark/config/stark.breakpoints.yml b/core/themes/stark/config/stark.breakpoints.yml
new file mode 100644
index 0000000..e2eb626
--- /dev/null
+++ b/core/themes/stark/config/stark.breakpoints.yml
@@ -0,0 +1,3 @@
+mobile: '(min-width: 0px)'
+narrow: 'all and (min-width: 480px) and (max-width: 959px)'
+wide: 'all and (min-width: 960px)'
diff --git a/core/themes/stark/stark.info b/core/themes/stark/stark.info
index fbab2a0..83ba50b 100644
--- a/core/themes/stark/stark.info
+++ b/core/themes/stark/stark.info
@@ -3,4 +3,5 @@ description = This theme demonstrates Drupal's default HTML markup and CSS style
 package = Core
 version = VERSION
 core = 8.x
+
 stylesheets[all][] = css/layout.css