views: Make view::Views::GetPreferredSize() const.

ui/views/controls/scroll_view_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/controls/scroll_view.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/views/controls/scrollbar/overlay_scroll_bar.h"
 #include "ui/views/test/test_views.h"
 
 namespace views {
 
 namespace {
 
 const int kWidth = 100;
 const int kMinHeight = 50;
 const int kMaxHeight = 100;
 
 // View implementation that allows setting the preferred size.
 class CustomView : public View {
  public:
   CustomView() {}
 
   void SetPreferredSize(const gfx::Size& size) {
     preferred_size_ = size;
     PreferredSizeChanged();
   }
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE { return preferred_size_; }
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
+    return preferred_size_;
+  }
 
   virtual void Layout() OVERRIDE {
     gfx::Size pref = GetPreferredSize();
     int width = pref.width();
     int height = pref.height();
     if (parent()) {
       width = std::max(parent()->width(), width);
       height = std::max(parent()->height(), height);
     }
     SetBounds(x(), y(), width, height);
@@ skipping 286 matching lines @@
   scroll_view.Layout();
 
   int scroll_bar_width = scroll_view.GetScrollBarWidth();
   int expected_width = kWidth - scroll_bar_width;
   EXPECT_EQ(scroll_view.contents()->size().width(), expected_width);
   EXPECT_EQ(scroll_view.contents()->size().height(), 1000 * expected_width);
   EXPECT_EQ(gfx::Size(kWidth, kMaxHeight), scroll_view.size());
 }
 
 }  // namespace views