Prerender: omnibox and instant field trial parameters.

chrome/browser/prerender/prerender_test_utils.h

Index: chrome/browser/prerender/prerender_test_utils.h
diff --git a/chrome/browser/prerender/prerender_test_utils.h b/chrome/browser/prerender/prerender_test_utils.h
index 615a4f72b36aecb3d5cdf0b5022b77a62244fef4..40da70aa063f7f1045412b96a3bb06b1613de160 100644
--- a/chrome/browser/prerender/prerender_test_utils.h
+++ b/chrome/browser/prerender/prerender_test_utils.h
@@ -386,6 +386,28 @@ class PrerenderInProcessBrowserTest : virtual public InProcessBrowserTest {
   DISALLOW_COPY_AND_ASSIGN(PrerenderInProcessBrowserTest);
 };
 
+// RAII class to save and restore the prerender mode.
+class RestorePrerenderMode {
+ public:
+  RestorePrerenderMode()
+      : prev_mode_(PrerenderManager::GetMode(ORIGIN_NONE)),
+        prev_omnibox_mode_(PrerenderManager::GetMode(ORIGIN_OMNIBOX)),
+        prev_instant_mode_(PrerenderManager::GetMode(ORIGIN_INSTANT)) {}
+
+  ~RestorePrerenderMode() {
+    PrerenderManager::SetMode(prev_mode_);
+    PrerenderManager::SetOmniboxMode(prev_omnibox_mode_);
+    PrerenderManager::SetInstantMode(prev_instant_mode_);
+  }
+
+ private:
+  PrerenderManager::PrerenderManagerMode prev_mode_;
+  PrerenderManager::PrerenderManagerMode prev_omnibox_mode_;
+  PrerenderManager::PrerenderManagerMode prev_instant_mode_;
+
+  DISALLOW_COPY_AND_ASSIGN(RestorePrerenderMode);
+};
+
 // Makes |url| respond to requests with the contents of |file|, counting the
 // number that start in |counter|.
 void CreateCountingInterceptorOnIO(