[Fetch API] Call endRead sooner to avoid recursive invocation

third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/stream-reader.js

Index: third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/stream-reader.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/stream-reader.js b/third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/stream-reader.js
index 3b0d513e9f905b7fea0ef923fa13673c2716448b..49625d3890644a58388475ca8d64d27fe0420748 100644
--- a/third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/stream-reader.js
+++ b/third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/stream-reader.js
@@ -37,6 +37,17 @@ promise_test(function(t) {
       });
   }, 'read contents with ReadableStreamReader');
 
+promise_test(() => {
+    let reader;
+    return fetch('/fetch/resources/progressive.php').then(res => {
+        reader = res.body.getReader();
+        return Promise.all([reader.read(), reader.read(), reader.read()]);
+      }).then(() => {
+        reader.releaseLock();
+        // We expect the test finishes without crashing.
+      });
+  }, 'parallel read');
+
 promise_test(function(t) {
     return fetch('/fetch/resources/progressive.php').then(function(res) {
         assert_false(res.bodyUsed);