Handle MOJO_RESULT_BUSY result in URLResponseBodyConsumer

third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js

Index: third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js b/third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js
index 470d3d7a49d77328ae916923e13293be9f64bfc7..92ccdd6fa936ce7de68cf1bd036eb4796230e336 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js
@@ -45,7 +45,11 @@ function makeXHRForJSONArguments(jsonArgs)
 
 function makeFetch(url, requestInitializer)
 {
-    return fetch(url, requestInitializer).catch(e => e);
+    return fetch(url, requestInitializer).then(res => {
+        // Call text(). Otherwise the backpressure mechanism may block loading.
+        res.text();
+        return res;
+    }).catch(e => e);
 }
 
 var initialize_NetworkTest = function() {