Insert panel icons on the left of other panel icons.

ash/launcher/launcher_model_unittest.cc

Index: ash/launcher/launcher_model_unittest.cc
diff --git a/ash/launcher/launcher_model_unittest.cc b/ash/launcher/launcher_model_unittest.cc
index c91a040b26574994efc4a32d53dfc3e16a700faa..23a3a34e95d667816fa87c7b7184371ad3050e8e 100644
--- a/ash/launcher/launcher_model_unittest.cc
+++ b/ash/launcher/launcher_model_unittest.cc
@@ -129,6 +129,37 @@ TEST(LauncherModel, BasicAssertions) {
   EXPECT_EQ("moved=1", observer.StateStringAndClear());
 }
 
+// Assertions about automatic index when adding items.
+TEST(LauncherModel, AutomaticIndex) {
+  TestLauncherModelObserver observer;
+  LauncherModel model;
+
+  // Model is initially populated with one item.
+  EXPECT_EQ(1, model.item_count());
+
+  // Insert browser short cut at index 0.
+  LauncherItem browser_shortcut;
+  browser_shortcut.type = TYPE_BROWSER_SHORTCUT;
+  int browser_shortcut_index = model.Add(browser_shortcut);
+  EXPECT_EQ(0, browser_shortcut_index);
+
+  // Tabbed (and any non-panel type) items are inserted at the right
+  LauncherItem item;
+  int tabbed_index1 = model.Add(item);
+  EXPECT_EQ(1, tabbed_index1);
+  int tabbed_index2 = model.Add(item);
+  EXPECT_EQ(2, tabbed_index2);
+
+  // Panel items are inserted at the left of other panels.
+  item.type = TYPE_APP_PANEL;
+  int app_panel_index1 = model.Add(item);
+  EXPECT_EQ(4, app_panel_index1);
+
+  item.type = TYPE_APP_PANEL;
+  int app_panel_index2 = model.Add(item);
+  EXPECT_EQ(4, app_panel_index2);
+}
+
 // Assertions around where items are added.
 TEST(LauncherModel, AddIndices) {
   TestLauncherModelObserver observer;