predictors: Add prefetching hit/miss histograms.

chrome/browser/predictors/resource_prefetcher_unittest.cc

Index: chrome/browser/predictors/resource_prefetcher_unittest.cc
diff --git a/chrome/browser/predictors/resource_prefetcher_unittest.cc b/chrome/browser/predictors/resource_prefetcher_unittest.cc
index a412b552bcdab7ea207a15af92f6deee54fdc0f5..6f190d005d57cce686f3d87eb828ee0d470e63b4 100644
--- a/chrome/browser/predictors/resource_prefetcher_unittest.cc
+++ b/chrome/browser/predictors/resource_prefetcher_unittest.cc
@@ -67,8 +67,9 @@ class TestResourcePrefetcherDelegate : public ResourcePrefetcher::Delegate {
     return request_context_getter_->GetURLRequestContext();
   }
 
-  MOCK_METHOD1(ResourcePrefetcherFinished,
-               void(ResourcePrefetcher* prefetcher));
+  MOCK_METHOD2(ResourcePrefetcherFinished,
+               void(ResourcePrefetcher* prefetcher,
+                    const ResourcePrefetcher::PrefetcherStats&));
 
  private:
   scoped_refptr<net::TestURLRequestContextGetter> request_context_getter_;
@@ -222,7 +223,7 @@ TEST_F(ResourcePrefetcherTest, TestPrefetcherFinishes) {
 
   // Expect the final call.
   EXPECT_CALL(prefetcher_delegate_,
-              ResourcePrefetcherFinished(Eq(prefetcher_.get())));
+              ResourcePrefetcherFinished(Eq(prefetcher_.get()), testing::_));
 
   OnResponse("http://yahoo.com/resource3.png");
   CheckPrefetcherState(0, 0, 0);
@@ -266,7 +267,7 @@ TEST_F(ResourcePrefetcherTest, TestPrefetcherStopped) {
 
   // Expect the final call.
   EXPECT_CALL(prefetcher_delegate_,
-              ResourcePrefetcherFinished(Eq(prefetcher_.get())));
+              ResourcePrefetcherFinished(Eq(prefetcher_.get()), testing::_));
 
   OnResponse("http://m.google.com/resource1.jpg");
   CheckPrefetcherState(0, 1, 0);
@@ -312,7 +313,7 @@ TEST_F(ResourcePrefetcherTest, TestHistogramsCollected) {
 
   // Expect the final call.
   EXPECT_CALL(prefetcher_delegate_,
-              ResourcePrefetcherFinished(Eq(prefetcher_.get())));
+              ResourcePrefetcherFinished(Eq(prefetcher_.get()), testing::_));
 
   OnResponse("http://www.google.com/resource6.png");
   histogram_tester.ExpectTotalCount(