Upstream TabAndroid abstract class.

chrome/browser/android/tab_android_stubs.cc

Index: chrome/browser/android/tab_android_stubs.cc
diff --git a/chrome/browser/android/tab_android_stubs.cc b/chrome/browser/android/tab_android_stubs.cc
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+// 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.
+
+// This file contains stubs for some Chrome for Android specific code that is
+// needed to compile some tests.
+
+#include "chrome/browser/android/tab_android.h"
+
+// static
+TabAndroid* TabAndroid::FromWebContents(content::WebContents* web_contents) {
+  return NULL;
+}
+
+// static
+TabAndroid* TabAndroid::GetNativeTab(JNIEnv* env, jobject obj) {
+  return NULL;
+}