CrOS: Prefer discarding internal web UI pages when out of memory

chrome/browser/chromeos/memory/oom_priority_manager_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 <algorithm>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/string16.h"
 #include "base/time.h"
 #include "chrome/browser/chromeos/memory/oom_priority_manager.h"
+#include "chrome/common/url_constants.h"
+#include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
 
 typedef testing::Test OomPriorityManagerTest;
 
 namespace {
 enum TestIndicies {
   kSelected,
   kPinned,
   kApp,
   kRecent,
   kOld,
   kReallyOld,
-  kOldButPinned
+  kOldButPinned,
+  kReloadableUI,
 };
 }  // namespace
 
 // Tests the sorting comparator so that we know it's producing the
 // desired order.
 TEST_F(OomPriorityManagerTest, Comparator) {
   chromeos::OomPriorityManager::TabStatsList test_list;
   const base::TimeTicks now = base::TimeTicks::Now();
 
   // Add kSelected last to verify we are sorting the array.
@@ skipping 34 matching lines @@
   }
 
   {
     OomPriorityManager::TabStats stats;
     stats.is_pinned = true;
     stats.last_selected = now - base::TimeDelta::FromDays(365);
     stats.renderer_handle = kOldButPinned;
     test_list.push_back(stats);
   }
 
+  {
+    OomPriorityManager::TabStats stats;
+    stats.is_reloadable_ui = true;
+    stats.renderer_handle = kReloadableUI;
+    test_list.push_back(stats);
+  }
+
   // This entry sorts to the front, so by adding it last we verify that
   // we are actually sorting the array.
   {
     OomPriorityManager::TabStats stats;
     stats.is_selected = true;
     stats.renderer_handle = kSelected;
     test_list.push_back(stats);
   }
 
   std::sort(test_list.begin(),
             test_list.end(),
             OomPriorityManager::CompareTabStats);
 
   EXPECT_EQ(kSelected, test_list[0].renderer_handle);
   EXPECT_EQ(kPinned, test_list[1].renderer_handle);
   EXPECT_EQ(kOldButPinned, test_list[2].renderer_handle);
   EXPECT_EQ(kApp, test_list[3].renderer_handle);
   EXPECT_EQ(kRecent, test_list[4].renderer_handle);
   EXPECT_EQ(kOld, test_list[5].renderer_handle);
   EXPECT_EQ(kReallyOld, test_list[6].renderer_handle);
+  EXPECT_EQ(kReloadableUI, test_list[7].renderer_handle);
+}
+
+TEST_F(OomPriorityManagerTest, IsReloadableUI) {
+  EXPECT_TRUE(OomPriorityManager::IsReloadableUI(
+      GURL(chrome::kChromeUIDownloadsURL)));
+  EXPECT_TRUE(OomPriorityManager::IsReloadableUI(
+      GURL(chrome::kChromeUIHistoryURL)));
+  EXPECT_TRUE(OomPriorityManager::IsReloadableUI(
+      GURL(chrome::kChromeUINewTabURL)));
+  EXPECT_TRUE(OomPriorityManager::IsReloadableUI(
+      GURL(chrome::kChromeUISettingsURL)));
+
+  // Debugging URLs are not included.
+  EXPECT_FALSE(OomPriorityManager::IsReloadableUI(
+      GURL(chrome::kChromeUIDiscardsURL)));
+  EXPECT_FALSE(OomPriorityManager::IsReloadableUI(
+      GURL(chrome::kChromeUINetInternalsURL)));
+
+  // Prefix matches are included.
+  EXPECT_TRUE(OomPriorityManager::IsReloadableUI(
+      GURL("chrome://settings/fakeSetting")));
 }
 
 }  // namespace chromeos