Implementation for switching between recently used tabs using ctrl tilde or quoteleft.

chrome/browser/tabs/tab_strip_model_unittest.cc

Index: chrome/browser/tabs/tab_strip_model_unittest.cc
diff --git a/chrome/browser/tabs/tab_strip_model_unittest.cc b/chrome/browser/tabs/tab_strip_model_unittest.cc
index 178fe53bcf417aa5cecd89c058ce2298b931f894..b237c26d172587a51e689eefc684075025f76fe5 100644
--- a/chrome/browser/tabs/tab_strip_model_unittest.cc
+++ b/chrome/browser/tabs/tab_strip_model_unittest.cc
@@ -734,6 +734,36 @@ static void InsertTabContentses(TabStripModel* tabstrip,
                                 contents3, TabStripModel::ADD_INHERIT_GROUP);
 }
 
+TEST_F(TabStripModelTest, TestSelectNextMRUTab) {
+  TabStripDummyDelegate delegate(NULL);
+  TabStripModel tabstrip(&delegate, profile());
+  EXPECT_TRUE(tabstrip.empty());
+
+  TabContentsWrapper* opener_contents = CreateTabContents();
+  tabstrip.AppendTabContents(opener_contents, true);
+
+  TabContentsWrapper* contents1 = CreateTabContents();
+  TabContentsWrapper* contents2 = CreateTabContents();
+  TabContentsWrapper* contents3 = CreateTabContents();
+
+  // Test LTR
+  InsertTabContentses(&tabstrip, contents1, contents2, contents3);
+  EXPECT_EQ(contents1, tabstrip.GetTabContentsAt(1));
+  EXPECT_EQ(contents2, tabstrip.GetTabContentsAt(2));
+  EXPECT_EQ(contents3, tabstrip.GetTabContentsAt(3));
+
+  EXPECT_EQ(0, tabstrip.active_index());
+  tabstrip.ActivateTabAt(1, true);
+  EXPECT_EQ(1, tabstrip.active_index());
+
+  // Next MRU Tab is tab from where we switched to tab 1 i.e tab 2
+  tabstrip.SelectNextMRUTab();
+  EXPECT_EQ(0, tabstrip.active_index());
+
+  tabstrip.CloseAllTabs();
+  EXPECT_TRUE(tabstrip.empty());
+}
+
 // Tests opening background tabs.
 TEST_F(TabStripModelTest, TestLTRInsertionOptions) {
   TabStripDummyDelegate delegate(NULL);