Plumb manifest fetching through WebTestDelegate interface

content/shell/renderer/test_runner/web_test_delegate.h

Index: content/shell/renderer/test_runner/web_test_delegate.h
diff --git a/content/shell/renderer/test_runner/web_test_delegate.h b/content/shell/renderer/test_runner/web_test_delegate.h
index 7a88a6a2829fa9a368c07bde8911c4437bab00c4..3a6e56f9a9743d5205a6cfbf9fd60ba294794e01 100644
--- a/content/shell/renderer/test_runner/web_test_delegate.h
+++ b/content/shell/renderer/test_runner/web_test_delegate.h
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "third_party/WebKit/public/platform/WebScreenOrientationType.h"
 #include "third_party/WebKit/public/platform/WebString.h"
@@ -24,6 +25,8 @@ class WebGamepad;
 class WebGamepads;
 class WebHistoryItem;
 class WebLayer;
+class WebURLResponse;
+class WebView;
 struct WebRect;
 struct WebSize;
 struct WebURLError;
@@ -201,6 +204,13 @@ class WebTestDelegate {
   // with the given WebTestProxyBase.
   virtual std::string DumpHistoryForWindow(WebTestProxyBase* proxy) = 0;
 
+  // Fetch the manifest for a given WebView from the given url.
+  virtual void FetchManifest(
+      blink::WebView* view,
+      const GURL& url,
+      const base::Callback<void(const blink::WebURLResponse& response,
+                                const std::string& data)>& callback) = 0;
+
   // Sends a message to the LayoutTestPermissionManager in order for it to
   // update its database.
   virtual void SetPermission(const std::string& permission_name,