Do conservative prerendering based on the LocalPredictor in Dev/Canary.

chrome/browser/prerender/prerender_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop.h"
 #include "base/stringprintf.h"
 #include "base/time.h"
@@ skipping 643 matching lines @@
           Referrer(url, WebKit::WebReferrerPolicyDefault), kSize));
   CHECK(pending_prerender_handle.get());
   EXPECT_FALSE(pending_prerender_handle->IsPrerendering());
 
   EXPECT_TRUE(prerender_contents->prerendering_has_started());
   ASSERT_EQ(prerender_contents, prerender_manager()->FindAndUseEntry(url));
 
   EXPECT_TRUE(pending_prerender_handle->IsPrerendering());
   ASSERT_EQ(pending_prerender_contents,
             prerender_manager()->FindAndUseEntry(pending_url));
+  EXPECT_FALSE(pending_prerender_handle->IsPrerendering());
 }
 
 TEST_F(PrerenderTest, InvalidPendingPrerenderTest) {
   GURL url("http://www.google.com/");
   DummyPrerenderContents* prerender_contents =
       prerender_manager()->CreateNextPrerenderContents(
           url,
           FINAL_STATUS_USED);
   EXPECT_TRUE(AddSimplePrerender(url));
 
@@ skipping 740 matching lines @@
   EXPECT_EQ(null, prerender_manager()->FindEntry(second_url));
 
   // The first prerender should have died, giving life to the second one.
   prerender_manager()->AdvanceTimeTicks(wait_for_first_prerender_to_expire);
   EXPECT_EQ(null, prerender_manager()->FindEntry(first_url));
   EXPECT_EQ(second_prerender_contents,
             prerender_manager()->FindAndUseEntry(second_url));
 }
 
 }  // namespace prerender