[DevTools] Always report encodedDataLength in Network.ResponseReceived.

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/data-xfer-resource.php

+<?php
+header_remove("X-Powered-By");
+
+$redirect = (bool) $_GET["redirect"];
+$cached = (bool) $_GET["cached"];
+$chunked = (bool) $_GET["chunked"];
+$size = (int) $_GET["size"];
+$gzip = (bool) $_GET["gzip"];
+$flush_header_with_x_bytes = (int) $_GET["flush_header_with_x_bytes"];
+$wait_after_headers_packet = (int) $_GET["wait_after_headers_packet"];
+$flush_every_x_bytes = ((int) $_GET["flush_every"])?:1;
+$wait_every_x_bytes = ((int) $_GET["wait_every_x_bytes"])?:0xFFFFF;
+$wait_duration_every_x_bytes = ((int) $_GET["wait_duration_every_x_bytes"])?:50;
+
+$sent_data_size = 0;
+
+if ($redirect) {
+    unset($_GET["redirect"]);
+    header("Location: ?" . http_build_query($_GET));
+    exit;
+}
+
+// This is done because it should force netstack to handle data as it comes.
+header("Content-Type: application/json");
+
+if ($cached) {
+    header("HTTP/1.0 304 Not Modified");
+    exit;
+}
+
+if ($gzip)
+    ob_start("ob_gzhandler");
+else
+    ob_start();
+
+if (!$chunked)
+    header("Content-Length: " . $size);
+
+if ($flush_header_with_x_bytes) {
+    send_data($flush_header_with_x_bytes);
+    doFlush();
+}
+
+if ($wait_after_headers_packet)
+    usleep($wait_after_headers_packet * 1000);
+
+while ($sent_data_size < $size) {
+    $flush_size = $flush_every_x_bytes - ($sent_data_size % $flush_every_x_bytes);
+    $wait_size = $wait_every_x_bytes - ($sent_data_size % $wait_every_x_bytes);
+    if ($flush_size === $wait_size) {
+        send_data($flush_size);
+        doFlush();
+        usleep($wait_duration_every_x_bytes * 1000);
+    } else if ($flush_size < $wait_size) {
+        send_data($flush_size);
+        doFlush();
+    } else {
+        send_data($wait_size);
+        usleep($wait_duration_every_x_bytes * 1000);
+    }
+}
+
+function send_data($size)
+{
+    global $sent_data_size;
+    echo str_repeat("a", $size);
+    $sent_data_size += $size;
+}
+
+function doFlush()
+{
+    ob_flush();
+    flush();
+}