Makes the touch tabstrip scroll so that tabs opened in the background

chrome/browser/ui/views/tabs/touch_tab_strip_layout_unittest.cc

Index: chrome/browser/ui/views/tabs/touch_tab_strip_layout_unittest.cc
diff --git a/chrome/browser/ui/views/tabs/touch_tab_strip_layout_unittest.cc b/chrome/browser/ui/views/tabs/touch_tab_strip_layout_unittest.cc
index 9f369b204e57224cd3d4787edc6ba2785cbcad5a..c990d8a06dfcb1c66c3ab3742c18cca3a5000f30 100644
--- a/chrome/browser/ui/views/tabs/touch_tab_strip_layout_unittest.cc
+++ b/chrome/browser/ui/views/tabs/touch_tab_strip_layout_unittest.cc
@@ -232,6 +232,16 @@ TEST_F(TouchTabStripLayoutTest, AddTab) {
     bool add_active;
     bool add_mini;
   } test_data[] = {
+    // Adding a background tab test cases.
+    { { 0, 300, 100, -10, 2, 0, 1, "0 90 180 198 200", "0 16 106 196 198 200"},
+      3, false, false },
+    { { 0, 300, 100, -10, 2, 0, 1, "0 90 180 198 200", "0 2 4 20 110 200"},
+      5, false, false },
+    { { 0, 300, 100, -10, 2, 0, 1, "0 90 180 198 200", "0 90 180 196 198 200"},
+      2, false, false },
+    { { 0, 300, 100, -10, 2, 0, 1, "0 90 180 198 200", "0 2 4 94 184 200"},
+      0, false, false },
+
     { { 4, 200, 100, -10, 2, 1, 2, "0 4 10 100", "0 0 8 10 100"},
       1, false, true },
     { { 4, 200, 100, -10, 2, 1, 2, "0 4 10 100", "0 0 8 98 100"},