Extend the TestRunner so that the manifest-src CSP directive can be tested from layout tests.

content/public/test/layouttest_support.h

Index: content/public/test/layouttest_support.h
diff --git a/content/public/test/layouttest_support.h b/content/public/test/layouttest_support.h
index 70676ea7af31fdabf68382bb00c27d18b5270722..2810e1192b2978360f7a46347386ea78a9921301 100644
--- a/content/public/test/layouttest_support.h
+++ b/content/public/test/layouttest_support.h
@@ -11,6 +11,7 @@
 #include "base/callback_forward.h"
 #include "cc/layers/texture_layer.h"
 #include "third_party/WebKit/public/platform/WebScreenOrientationType.h"
+#include "url/gurl.h"
 
 namespace blink {
 class WebBatteryStatus;
@@ -20,6 +21,8 @@ class WebGamepad;
 class WebGamepads;
 class WebLayer;
 struct WebSize;
+class WebView;
+class WebURLResponse;
 }
 
 namespace content {
@@ -45,6 +48,10 @@ void EnableRendererLayoutTestMode();
 void EnableWebTestProxyCreation(
     const base::Callback<void(RenderView*, WebTestProxyBase*)>& callback);
 
+void FetchManifest(blink::WebView* view, GURL url,
+    base::Callback<void(const blink::WebURLResponse& response,
+                        const std::string& data)> callback);

[mlamouri (slow - plz ping), 2014/09/18 17:36:05]

nit: I think it would be better to have a type for that callback.
FetchManifestCallback?

Actually, it would have been clearer that you are not using |const Callback&|
which you should.

+
 // Sets gamepad provider to be used for layout tests.
 void SetMockGamepadProvider(scoped_ptr<RendererGamepadProvider> provider);