[Devtools] Fixed resource having no content if from xhr blob

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html

Index: third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html b/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html
index bc93957aee3d03044e32a749c5a5baac195fdc41..ccd1a1720ce389bd4a9735623b000d89ee33a3d9 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html
@@ -298,6 +298,17 @@ InspectorTest.evaluateInPage = function(string, callback)
     });
 };
 
+/**
+ * Evaluates expression in page.

[dgozman, 2017/05/02 19:36:37]

We don't add comments.

+ * @param {string} expression
+ * @return {!Promise<?>}
+ */
+InspectorTest.evaluateInPagePromise = function(expression)
+{
+    return InspectorTest.sendCommandPromise("Runtime.evaluate", { "expression": expression, awaitPromise: false, returnByValue: true });
+};
+
+// Use this if the expression being ran in page is a promise.
 InspectorTest.evaluateInPageAsync = function(expression)
 {
     return InspectorTest.sendCommandPromise("Runtime.evaluate", { "expression": expression, awaitPromise: true, returnByValue: true }).then((message) => message.result.result.value);