Export shouldTreatURLSchemeAsSecure.

public/web/WebSecurityPolicy.h

Index: public/web/WebSecurityPolicy.h
diff --git a/public/web/WebSecurityPolicy.h b/public/web/WebSecurityPolicy.h
index a21f36c23a209083c7adcf24a56a9a35e14d52d4..f22998cce4e9a0300d8c1d03a7c723c2f7366c23 100644
--- a/public/web/WebSecurityPolicy.h
+++ b/public/web/WebSecurityPolicy.h
@@ -61,10 +61,14 @@ public:
     // schemes are not registered as "secure" are embedded.
     BLINK_EXPORT static void registerURLSchemeAsRestrictingMixedContent(const WebString&);
 
-    // Registers a URL scheme to not generate mixed content warnings when
-    // included by page whose scheme is registed as restricting mixed content.
+    // Subresources transported by secure schemes do not trigger mixed content
+    // warnings. For example, https and data are secure schemes because they
+    // cannot be corrupted by active network attackers.
     BLINK_EXPORT static void registerURLSchemeAsSecure(const WebString&);
 
+    // Returns true if the scheme has been registered as a secure scheme.
+    BLINK_EXPORT static bool shouldTreatURLSchemeAsSecure(const WebString&);
+
     // Registers a non-HTTP URL scheme which can be sent CORS requests.
     BLINK_EXPORT static void registerURLSchemeAsCORSEnabled(const WebString&);