Add CefURLRequest::ResponseWasCached method (issue #2283)

libcef/renderer/webkit_glue.h

@@ -22,6 +22,7 @@ class WebElement;
 class WebLocalFrame;
 class WebNode;
 class WebString;
+class WebURLResponse;
 class WebView;
 }  // namespace blink
 
@@ -81,6 +82,8 @@ class BLINK_EXPORT CefScriptForbiddenScope final {
   DISALLOW_COPY_AND_ASSIGN(CefScriptForbiddenScope);
 };
 
+BLINK_EXPORT bool ResponseWasCached(const blink::WebURLResponse& response);
+
 }  // namespace webkit_glue
 
 #endif  // CEF_LIBCEF_RENDERER_WEBKIT_GLUE_H_