Adds unit tests for offline_pages::PrerenderAdapter calling PrerenderManager.

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 363e9360679cff5c21296fbeaaa4e9dd0eeab67e..a318e4d7a4daba27b25a25034215f7f3d0a3552c 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -848,12 +848,6 @@ PrerenderContents* PrerenderManager::PrerenderData::ReleaseContents() {
   return contents_.release();
 }
 
-void PrerenderManager::SetPrerenderContentsFactory(
-    PrerenderContents::Factory* prerender_contents_factory) {
-  DCHECK(CalledOnValidThread());
-  prerender_contents_factory_.reset(prerender_contents_factory);
-}
-
 void PrerenderManager::SourceNavigatedAway(PrerenderData* prerender_data) {
   // The expiry time of our prerender data will likely change because of
   // this navigation. This requires a resort of active_prerenders_.
@@ -1309,4 +1303,10 @@ void PrerenderManager::RenderProcessHostDestroyed(
   DCHECK_EQ(1u, erased);
 }
 
+void PrerenderManager::SetPrerenderContentsFactoryForTest(
+    PrerenderContents::Factory* prerender_contents_factory) {
+  DCHECK(CalledOnValidThread());
+  prerender_contents_factory_.reset(prerender_contents_factory);
+}
+
 }  // namespace prerender