Gets tab dragging to work in touch mode.

ui/views/view_model_unittest.cc

 // 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.
 
 #include "ui/views/view_model.h"
 
+#include "base/string_number_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/views/view.h"
 
 namespace views {
 
+namespace {
+
+// Returns a string containing the x-coordinate of each of the views in |model|.
+std::string BoundsString(const ViewModel& model) {
+  std::string result;
+  for (int i = 0; i < model.view_size(); ++i) {
+    if (i != 0)
+      result += " ";
+    result += base::IntToString(model.ideal_bounds(i).x());
+  }
+  return result;
+}
+
+// Returns a string containing the id of each of the views in |model|.
+std::string ViewIDsString(const ViewModel& model) {
+  std::string result;
+  for (int i = 0; i < model.view_size(); ++i) {
+    if (i != 0)
+      result += " ";
+    result += base::IntToString(model.view_at(i)->id());
+  }
+  return result;
+}
+
+}  // namespace
+
 TEST(ViewModel, BasicAssertions) {
   View v1;
   ViewModel model;
   model.Add(&v1, 0);
   EXPECT_EQ(1, model.view_size());
   EXPECT_EQ(&v1, model.view_at(0));
   gfx::Rect v1_bounds(1, 2, 3, 4);
   model.set_ideal_bounds(0, v1_bounds);
   EXPECT_EQ(v1_bounds, model.ideal_bounds(0));
   EXPECT_EQ(0, model.GetIndexOfView(&v1));
 }
 
 TEST(ViewModel, Move) {
   View v1, v2, v3;
+  v1.set_id(0);
+  v2.set_id(1);
+  v3.set_id(2);
   ViewModel model;
   model.Add(&v1, 0);
   model.Add(&v2, 1);
   model.Add(&v3, 2);
   model.Move(0, 2);
-  EXPECT_EQ(&v1, model.view_at(2));
-  EXPECT_EQ(&v2, model.view_at(0));
-  EXPECT_EQ(&v3, model.view_at(1));
+  EXPECT_EQ("1 2 0", ViewIDsString(model));
 
   model.Move(2, 0);
-  EXPECT_EQ(&v1, model.view_at(0));
-  EXPECT_EQ(&v2, model.view_at(1));
-  EXPECT_EQ(&v3, model.view_at(2));
+  EXPECT_EQ("0 1 2", ViewIDsString(model));
+}
+
+TEST(ViewModel, MoveViewOnly) {
+  View v1, v2, v3;
+  v1.set_id(0);
+  v2.set_id(1);
+  v3.set_id(2);
+  ViewModel model;
+  model.Add(&v1, 0);
+  model.Add(&v2, 1);
+  model.Add(&v3, 2);
+  model.set_ideal_bounds(0, gfx::Rect(10, 0, 1, 2));
+  model.set_ideal_bounds(1, gfx::Rect(11, 0, 1, 2));
+  model.set_ideal_bounds(2, gfx::Rect(12, 0, 1, 2));
+  model.MoveViewOnly(0, 2);
+  EXPECT_EQ("1 2 0", ViewIDsString(model));
+  EXPECT_EQ("10 11 12", BoundsString(model));
+
+  model.MoveViewOnly(2, 0);
+  EXPECT_EQ("0 1 2", ViewIDsString(model));
+  EXPECT_EQ("10 11 12", BoundsString(model));
+
+  model.MoveViewOnly(0, 1);
+  EXPECT_EQ("1 0 2", ViewIDsString(model));
+  EXPECT_EQ("10 11 12", BoundsString(model));
+
+  model.MoveViewOnly(1, 0);
+  EXPECT_EQ("0 1 2", ViewIDsString(model));
+  EXPECT_EQ("10 11 12", BoundsString(model));
 }
 
 }  // namespace views