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31 #ifndef WebPrerenderingSupport_h
32 #define WebPrerenderingSupport_h
34 #include "WebCommon.h"
40 class WebPrerenderingSupport {
42 BLINK_PLATFORM_EXPORT static void initialize(WebPrerenderingSupport*);
43 BLINK_PLATFORM_EXPORT static void shutdown();
44 BLINK_PLATFORM_EXPORT static WebPrerenderingSupport* current();
46 // A prerender link element is added when it is inserted into a document.
47 virtual void add(const WebPrerender&) = 0;
49 // A prerender is canceled when it is removed from a document.
50 virtual void cancel(const WebPrerender&) = 0;
52 // A prerender is abandoned when it's navigated away from or suspended in the page cache. This
53 // is a weaker signal than cancel(), since the launcher hasn't indicated that the prerender isn't
54 // wanted, and we may end up using it after, for instance, a short redirect chain.
55 virtual void abandon(const WebPrerender&) = 0;
58 WebPrerenderingSupport() { }
59 virtual ~WebPrerenderingSupport() { }
62 static WebPrerenderingSupport* s_platform;
67 #endif // WebPrerenderingSupport_h