Add PrintedPage::GetCenteredPageContentRect so Mac and Win can share code.

printing/printed_page_unittest.cc

+// Copyright (c) 2010 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 "printing/printed_page.h"
+
+#include <string>
+#include <vector>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace printing {
+
+TEST(PrintedPageTest, GetCenteredPageContentRect) {
+  scoped_refptr<PrintedPage> page;
+  gfx::Rect page_content;
+
+  // No centering.
+  page =new PrintedPage(1,
+                        NULL,
+                        gfx::Size(1200, 1200),
+                        gfx::Rect(0, 0, 400, 1100),
+                        true);
+  page->GetCenteredPageContentRect(gfx::Size(1000, 1000), &page_content);
+  EXPECT_EQ(0, page_content.x());
+  EXPECT_EQ(0, page_content.y());
+  EXPECT_EQ(400, page_content.width());
+  EXPECT_EQ(1100, page_content.height());
+
+  // X centered.
+  page = new PrintedPage(1,
+                         NULL,
+                         gfx::Size(500, 1200),
+                         gfx::Rect(0, 0, 400, 1100),
+                         true);
+  page->GetCenteredPageContentRect(gfx::Size(1000, 1000), &page_content);
+  EXPECT_EQ(250, page_content.x());
+  EXPECT_EQ(0, page_content.y());
+  EXPECT_EQ(400, page_content.width());
+  EXPECT_EQ(1100, page_content.height());
+
+  // Y centered.
+  page = new PrintedPage(1,
+                         NULL,
+                         gfx::Size(1200, 500),
+                         gfx::Rect(0, 0, 400, 1100),
+                         true);
+  page->GetCenteredPageContentRect(gfx::Size(1000, 1000), &page_content);
+  EXPECT_EQ(0, page_content.x());
+  EXPECT_EQ(250, page_content.y());
+  EXPECT_EQ(400, page_content.width());
+  EXPECT_EQ(1100, page_content.height());
+
+  // Both X and Y centered.
+  page = new PrintedPage(1,
+                         NULL,
+                         gfx::Size(500, 500),
+                         gfx::Rect(0, 0, 400, 1100),
+                         true);
+  page->GetCenteredPageContentRect(gfx::Size(1000, 1000), &page_content);
+  EXPECT_EQ(250, page_content.x());
+  EXPECT_EQ(250, page_content.y());
+  EXPECT_EQ(400, page_content.width());
+  EXPECT_EQ(1100, page_content.height());
+}
+
+}  // namespace printing