New Task Manager - Phase 1.3.2.B: Implement Tab Contents Task Providing (Prerender)

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index 7b742f03bd6e354df0f5faaac73475686f9834d7..c08cfaa2b01cd99ddedc3fba5f065e8f0265161e 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -16,6 +16,7 @@
 #include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
 #include "base/scoped_observer.h"
+#include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ -48,6 +49,9 @@
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "chrome/browser/safe_browsing/safe_browsing_util.h"
 #include "chrome/browser/safe_browsing/test_database_manager.h"
+#include "chrome/browser/task_management/providers/task_provider_observer.h"
+#include "chrome/browser/task_management/providers/web_contents/web_contents_tags_manager.h"
+#include "chrome/browser/task_management/providers/web_contents/web_contents_task_provider.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/browser/task_manager/task_manager_browsertest_util.h"
 #include "chrome/browser/ui/browser.h"
@@ -4080,4 +4084,100 @@ IN_PROC_BROWSER_TEST_F(PrerenderBrowserTestWithNaCl,
 }
 #endif  // !defined(DISABLE_NACL)
 
+#if defined(ENABLE_TASK_MANAGER)
+
+namespace {
+
+// Defines a test class for testing that will act as a mock task manager.
+class MockTaskManager : public task_management::TaskProviderObserver {
+ public:
+  MockTaskManager() {}
+  ~MockTaskManager() override {}
+
+  // task_management::Task_providerObserver:
+  void TaskAdded(task_management::Task* task) override {
+    EXPECT_FALSE(ContainsKey(provided_tasks_, task));
+    provided_tasks_.insert(task);
+  }
+
+  void TaskRemoved(task_management::Task* task) override {
+    EXPECT_TRUE(ContainsKey(provided_tasks_, task));
+    provided_tasks_.erase(task);
+  }
+
+  base::string16 GetPrerenderTitlePrefix() const {
+    return l10n_util::GetStringFUTF16(IDS_TASK_MANAGER_PRERENDER_PREFIX,
+                                      base::string16());
+  }
+
+  const std::set<task_management::WebContentsTag*>& tracked_tags() const {
+    return task_management::WebContentsTagsManager::GetInstance()->
+        tracked_tags();
+  }
+
+  const std::set<task_management::Task*>& provided_tasks() const {
+    return provided_tasks_;
+  }
+
+ private:
+  std::set<task_management::Task*> provided_tasks_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockTaskManager);
+};
+
+// Tests the correct recording of tags for the prerender WebContents.
+IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, TaskManagementTagsBasic) {
+  MockTaskManager task_manager;
+  EXPECT_TRUE(task_manager.tracked_tags().empty());
+
+  // Start prerendering a page and make sure it's correctly tagged.
+  PrerenderTestURL("files/prerender/prerender_page.html", FINAL_STATUS_USED, 1);
+  EXPECT_FALSE(task_manager.tracked_tags().empty());
+
+  // TODO(afakhry): Once we start tagging the tab contents the below tests
+  // must be changed.
+  EXPECT_EQ(1U, task_manager.tracked_tags().size());
+
+  // Swap in the prerendered content and make sure its tag is removed.
+  NavigateToDestURL();
+  EXPECT_TRUE(task_manager.tracked_tags().empty());
+}
+
+// Tests that the task manager will be provided by tasks that correspond to
+// prerendered WebContents.
+IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, TaskManagementTasksProvided) {
+  MockTaskManager task_manager;
+  EXPECT_TRUE(task_manager.tracked_tags().empty());
+
+  task_management::WebContentsTaskProvider provider;
+  provider.SetObserver(&task_manager);
+
+  // Still empty, no pre-existing tasks.
+  EXPECT_TRUE(task_manager.provided_tasks().empty());
+
+  // Start prerendering a page.
+  PrerenderTestURL("files/prerender/prerender_page.html", FINAL_STATUS_USED, 1);
+  EXPECT_FALSE(task_manager.tracked_tags().empty());
+
+  // TODO(afakhry): The below may not be true after we support more tags.
+  EXPECT_EQ(1U, task_manager.tracked_tags().size());
+  ASSERT_EQ(1U, task_manager.provided_tasks().size());
+
+  const task_management::Task* task = *task_manager.provided_tasks().begin();
+  EXPECT_EQ(task_management::Task::RENDERER, task->GetType());
+  const base::string16 title = task->title();
+  const base::string16 expected_prefix = task_manager.GetPrerenderTitlePrefix();
+  EXPECT_TRUE(base::StartsWith(title,
+                               expected_prefix,
+                               base::CompareCase::INSENSITIVE_ASCII));
+
+  NavigateToDestURL();
+  // TODO(afakhry): The below may not be true after we support more tags.
+  EXPECT_TRUE(task_manager.provided_tasks().empty());
+}
+
+}  // namespace
+
+#endif  // defined(ENABLE_TASK_MANAGER)
+
 }  // namespace prerender