Upstream TabModel and related classes.

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabList.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabList.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabList.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabList.java
new file mode 100644
index 0000000000000000000000000000000000000000..b4f32e09bf2888a604f3124080a60e2cbbe57939
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabList.java
@@ -0,0 +1,51 @@
+// Copyright 2014 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.
+
+package org.chromium.chrome.browser.tabmodel;
+
+import org.chromium.chrome.browser.Tab;
+
+/**
+ * A read only list of {@link Tab}s. This list understands the concept of an incognito list as
+ * well as a currently selected tab (see {@link #index}).
+ */
+public interface TabList {
+    public static final int INVALID_TAB_INDEX = -1;
+
+    /**
+     * @return Whether this tab model contains only incognito tabs or only normal tabs.
+     */
+    boolean isIncognito();
+
+    /**
+     * @return The index of the current tab, or {@link #INVALID_TAB_INDEX} if there are no tabs.
+     */
+    int index();
+
+    /**
+     * @return the number of open tabs in this model
+     */
+    int getCount();
+
+    /**
+     * Get the tab at the specified position
+     *
+     * @param index The index of the {@link Tab} to return.
+     * @return The {@code Tab} at position {@code index}, or {@code null} if {@code index} < 0
+     *         or {@code index} >= {@link #getCount()}.
+     */
+    Tab getTabAt(int index);
+
+    /**
+     * @return index of the given tab in the order of the tab stack.
+     */
+    int indexOf(Tab tab);
+
+    /**
+     * @param tabId The id of the {@link Tab} that might have a pending closure.
+     * @return      Whether or not the {@link Tab} specified by {@code tabId} has a pending
+     *              closure.
+     */
+    boolean isClosurePending(int tabId);
+}