Add observer interface to PrerenderContents.

chrome/browser/prerender/prerender_unittest.cc

Index: chrome/browser/prerender/prerender_unittest.cc
diff --git a/chrome/browser/prerender/prerender_unittest.cc b/chrome/browser/prerender/prerender_unittest.cc
index cacce16e97f0e6cbac65bea44d3ccb0848a5594a..a023d06a20924f295eed0b41d8ec1764296b7c20 100644
--- a/chrome/browser/prerender/prerender_unittest.cc
+++ b/chrome/browser/prerender/prerender_unittest.cc
@@ -59,7 +59,7 @@ class DummyPrerenderContents : public PrerenderContents {
   }
 
   virtual bool GetRouteId(int* route_id) const OVERRIDE {
-    *route_id = 0;
+    *route_id = route_id_;
     return true;
   }
 
@@ -70,10 +70,15 @@ class DummyPrerenderContents : public PrerenderContents {
   }
 
  private:
+  static int g_next_route_id_;
+  int route_id_;
+
   UnitTestPrerenderManager* test_prerender_manager_;
   FinalStatus expected_final_status_;
 };
 
+int DummyPrerenderContents::g_next_route_id_ = 0;
+
 const gfx::Size kSize(640, 480);
 
 }  // namespace
@@ -244,9 +249,10 @@ DummyPrerenderContents::DummyPrerenderContents(
     const GURL& url,
     Origin origin,
     FinalStatus expected_final_status)
-    : PrerenderContents(test_prerender_manager, prerender_tracker,
+    : PrerenderContents(test_prerender_manager,
                         NULL, url, Referrer(), origin,
                         PrerenderManager::kNoExperiment),
+      route_id_(g_next_route_id_++),
       test_prerender_manager_(test_prerender_manager),
       expected_final_status_(expected_final_status) {
 }
@@ -263,6 +269,7 @@ void DummyPrerenderContents::StartPrerendering(
   if (!is_control_group)
     prerendering_has_started_ = true;
   load_start_time_ = test_prerender_manager_->GetCurrentTimeTicks();
+  NotifyPrerenderStart();
 }
 
 class PrerenderTest : public testing::Test {