Test extension reloading behavior.

content/public/browser/site_instance.h

Index: content/public/browser/site_instance.h
diff --git a/content/public/browser/site_instance.h b/content/public/browser/site_instance.h
index 0696fdccdfd3c36b147a812e2e5ef344637a3c09..d0ed33dba66ec1f17f5995a7dfcb85004bf04468 100644
--- a/content/public/browser/site_instance.h
+++ b/content/public/browser/site_instance.h
@@ -14,6 +14,7 @@ namespace content {
 class BrowserContext;
 class BrowsingInstance;
 class RenderProcessHost;
+class RenderProcessHostFactory;
 
 ///////////////////////////////////////////////////////////////////////////////
 // SiteInstance interface.
@@ -106,6 +107,14 @@ class CONTENT_EXPORT SiteInstance : public base::RefCounted<SiteInstance> {
   // origins (e.g., postMessage) should be supported.
   virtual bool IsRelatedSiteInstance(const SiteInstance* instance) = 0;
 
+  // Sets the factory used to create new RenderProcessHosts. This will also be
+  // passed on to SiteInstances spawned by this one.
+  // The factory must outlive the SiteInstance; ownership is not transferred. It
+  // may be NULL, in which case the default BrowserRenderProcessHost will be
+  // created (this is the behavior if you don't call this function).
+  virtual void SetRenderProcessHostFactory(
+      const RenderProcessHostFactory* rph_factory) = 0;
+
   // Factory method to create a new SiteInstance.  This will create a new
   // new BrowsingInstance, so it should only be used when creating a new tab
   // from scratch (or similar circumstances).  Callers should ensure that