Test extension reloading behavior.

chrome/browser/extensions/extension_process_manager.cc

Index: chrome/browser/extensions/extension_process_manager.cc
diff --git a/chrome/browser/extensions/extension_process_manager.cc b/chrome/browser/extensions/extension_process_manager.cc
index a4cb67f1b8d77a5d42549dcb1cb040af589eb23b..12b38b0549fffc0871df4d36c7dea3425ea162dc 100644
--- a/chrome/browser/extensions/extension_process_manager.cc
+++ b/chrome/browser/extensions/extension_process_manager.cc
@@ -191,6 +191,13 @@ ExtensionProcessManager::~ExtensionProcessManager() {
   DCHECK(background_hosts_.empty());
 }
 
+void ExtensionProcessManager::SetRenderProcessHostFactoryForTest(
+    content::RenderProcessHostFactory* rph_factory) {
+  DCHECK(background_hosts_.empty());
+  site_instance_->set_render_process_host_factory(rph_factory);
+}
+
+
 const ExtensionProcessManager::ViewSet
 ExtensionProcessManager::GetAllViews() const {
   ViewSet result;