Several background pattern fixes on the Mac....

chrome/browser/cocoa/tab_cell_unittest.mm

-// Copyright (c) 2009 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.
-
-#import <Cocoa/Cocoa.h>
-
-#include "base/scoped_nsobject.h"
-#import "chrome/browser/cocoa/tab_cell.h"
-#import "chrome/browser/cocoa/cocoa_test_helper.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "testing/platform_test.h"
-
-namespace {
-
-class TabCellTest : public PlatformTest {
- public:
-  TabCellTest() {
-    NSRect frame = NSMakeRect(0, 0, 50, 30);
-    view_.reset([[NSButton alloc] initWithFrame:frame]);
-    scoped_nsobject<TabCell> cell([[TabCell alloc] initTextCell:@"Testing"]);
-    [view_ setCell:cell.get()];
-    [cocoa_helper_.contentView() addSubview:view_.get()];
-  }
-
-  CocoaTestHelper cocoa_helper_;  // Inits Cocoa, creates window, etc...
-  scoped_nsobject<NSButton> view_;
-};
-
-// Test adding/removing from the view hierarchy, mostly to ensure nothing
-// leaks or crashes.
-TEST_F(TabCellTest, AddRemove) {
-  EXPECT_EQ(cocoa_helper_.contentView(), [view_ superview]);
-  [view_.get() removeFromSuperview];
-  EXPECT_FALSE([view_ superview]);
-}
-
-// Test drawing, mostly to ensure nothing leaks or crashes.
-TEST_F(TabCellTest, Display) {
-  [view_ display];
-}
-
-}  // namespace