Move some DocumentTabModel files upstream

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/document_tab_model_info.proto

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/document_tab_model_info.proto
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/document_tab_model_info.proto b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/document_tab_model_info.proto
new file mode 100644
index 0000000000000000000000000000000000000000..1fe0aee28e3183ad67118e4287801c06f66688f0
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/document_tab_model_info.proto
@@ -0,0 +1,23 @@
+// 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.
+//
+// Protocol buffer definition for a database of DocumentActivity state.
+
+syntax = "proto2";
+
+package org.chromium.chrome.browser.tabmodel.document;
+
+option java_outer_classname = "DocumentTabModelInfo";
+option java_package = "org.chromium.chrome.browser.tabmodel.document";
+
+message DocumentEntry {
+  // Next ID to use: 6
+  optional bool can_go_back = 4;
+  required int32 tab_id = 5;
+}
+
+message DocumentList {
+  // Next ID to use: 2
+  repeated DocumentEntry entries = 1;
+}