Componentize TopSites, TopSitesBackend, TopSitesDatabase

chrome/browser/extensions/api/top_sites/top_sites_apitest.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/values.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/api/top_sites/top_sites_api.h"
 #include "chrome/browser/extensions/extension_function_test_utils.h"
-#include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/history/top_sites_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/in_process_browser_test.h"
+#include "components/history/core/browser/top_sites.h"
 
 namespace utils = extension_function_test_utils;
 
 namespace extensions {
 
 namespace {
 
 class TopSitesExtensionTest : public InProcessBrowserTest {
  public:
-  TopSitesExtensionTest() : top_sites_inited_(false), waiting_(false) {
-  }
+  TopSitesExtensionTest()
+      : top_sites_prepopulated_pages_size_(0),
+        top_sites_inited_(false),
+        waiting_(false) {}
 
   void SetUpOnMainThread() override {
     scoped_refptr<history::TopSites> top_sites =
         TopSitesFactory::GetForProfile(browser()->profile());
 
+    top_sites_prepopulated_pages_size_ =
+        top_sites->GetPrepopulatedPages().size();
+
     // This may return async or sync. If sync, top_sites_inited_ will be true
     // before we get to the conditional below. Otherwise, we'll run a nested
     // message loop until the async callback.
     top_sites->GetMostVisitedURLs(
         base::Bind(&TopSitesExtensionTest::OnTopSitesAvailable, this), false);
 
     if (!top_sites_inited_) {
       waiting_ = true;
       base::MessageLoop::current()->Run();
     }
 
     // By this point, we know topsites has loaded. We can run the tests now.
   }
 
+  size_t top_sites_prepopulated_pages_size() const {
+    return top_sites_prepopulated_pages_size_;
+  }
+
  private:
   void OnTopSitesAvailable(const history::MostVisitedURLList& data) {
     if (waiting_) {
       base::MessageLoop::current()->Quit();
       waiting_ = false;
     }
     top_sites_inited_ = true;
   }
 
+  size_t top_sites_prepopulated_pages_size_;
   bool top_sites_inited_;
   bool waiting_;
 };
 
 }  // namespace
 
 IN_PROC_BROWSER_TEST_F(TopSitesExtensionTest, GetTopSites) {
   scoped_refptr<TopSitesGetFunction> get_top_sites_function(
       new TopSitesGetFunction());
   // Without a callback the function will not generate a result.
   get_top_sites_function->set_has_callback(true);
 
   scoped_ptr<base::Value> result(utils::RunFunctionAndReturnSingleResult(
       get_top_sites_function.get(), "[]", browser()));
   base::ListValue* list;
   ASSERT_TRUE(result->GetAsList(&list));
-  EXPECT_GE(list->GetSize(), arraysize(history::kPrepopulatedPages));
+  EXPECT_GE(list->GetSize(), top_sites_prepopulated_pages_size());
 }
 
 }  // namespace extensions