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

ui/views/layout/grid_layout_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/layout/grid_layout.h"
 
 #include "base/compiler_specific.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/views/view.h"
 
 namespace views {
 
 void ExpectViewBoundsEquals(int x, int y, int w, int h,
                             const View* view) {
   EXPECT_EQ(x, view->x());
   EXPECT_EQ(y, view->y());
   EXPECT_EQ(w, view->width());
   EXPECT_EQ(h, view->height());
 }
 
 class SettableSizeView : public View {
  public:
   explicit SettableSizeView(const gfx::Size& pref) {
     pref_ = pref;
   }
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     return pref_;
   }
 
  private:
    gfx::Size pref_;
 };
 
 // A view with fixed circumference that trades height for width.
 class FlexibleView : public View {
  public:
   explicit FlexibleView(int circumference) {
     circumference_ = circumference;
   }
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     return gfx::Size(0, circumference_ / 2);
   }
 
-  virtual int GetHeightForWidth(int width) OVERRIDE {
+  virtual int GetHeightForWidth(int width) const OVERRIDE {
     return std::max(0, circumference_ / 2 - width);
   }
 
  private:
    int circumference_;
 };
 
 class GridLayoutTest : public testing::Test {
  public:
   GridLayoutTest() : layout(&host) {}
@@ skipping 603 matching lines @@
   EXPECT_EQ(gfx::Size(10, 20), pref);
 
   layout.set_minimum_size(gfx::Size(40, 40));
   GetPreferredSize();
   EXPECT_EQ(gfx::Size(40, 40), pref);
 
   RemoveAll();
 }
 
 }  // namespace views