Adding Embedding-CSP HTTP header

third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/resources/get-embedding-csp-header-and-respond.php

Index: third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/resources/get-embedding-csp-header-and-respond.php
diff --git a/third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/resources/get-embedding-csp-header-and-respond.php b/third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/resources/get-embedding-csp-header-and-respond.php
new file mode 100644
index 0000000000000000000000000000000000000000..ff665f81fbaed67f45040e261348d4b936faa8f9
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/resources/get-embedding-csp-header-and-respond.php
@@ -0,0 +1,10 @@
+<?php
+    $embedding_csp_header = isset($_SERVER['HTTP_EMBEDDING_CSP']) ? addslashes($_SERVER['HTTP_EMBEDDING_CSP']) : null;
+?>
+
+<script>
+  var response = {};
+  response['src'] = '../resources/get-embedding-csp-header-and-respond.php';
+  response['embedding_csp'] = <?php echo is_null($embedding_csp_header) ? "null" : "\"${embedding_csp_header}\""; ?>;
+  window.top.postMessage(response, '*');
+</script>