Support the DPR header for client hints.

LayoutTests/http/tests/resources/dpr.php

Index: LayoutTests/http/tests/resources/dpr.php
diff --git a/LayoutTests/http/tests/resources/dpr.php b/LayoutTests/http/tests/resources/dpr.php
new file mode 100644
index 0000000000000000000000000000000000000000..d56d4acfb4b8d8a5ae9a8fae3ee4a91871606467
--- /dev/null
+++ b/LayoutTests/http/tests/resources/dpr.php
@@ -0,0 +1,18 @@
+<?php
+$name = $_GET['name'];
+$mimeType = $_GET['mimeType'];
+$dpr = $_GET['dpr'];
+
+$file = fopen($name, "rb");
+if (!$file)
+    die("Cannot open file.");
+
+header("Content-Type: " . $mimeType);
+header("Content-Length: " . filesize($name));
+header("DPR: ". $dpr);

[pdr., 2013/10/26 01:26:31]

Should the header name be "DPR" or "CH-DPR"?

I think the spec means to actually use "CH-DPR" ("3.1.  The Client Hints Request
Header Field".)

[pdr, 2013/10/27 21:04:39]

For posterity, I was just mixed up here. DPR is the correct value after all.

+
+echo(fread($file, filesize($name)));
+flush();
+ob_flush();
+fclose($file);
+?>