Several background pattern fixes on the Mac....

chrome/browser/cocoa/browser_frame_view_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 <objc/runtime.h>
+
+#include "base/scoped_nsobject.h"
+#import "chrome/browser/cocoa/browser_frame_view.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
+
+class BrowserFrameViewTest : public PlatformTest {
+ public:
+  BrowserFrameViewTest() {
+    NSRect frame = NSMakeRect(0, 0, 50, 50);
+    // We create NSGrayFrame instead of BrowserFrameView because
+    // we are swizzling into NSGrayFrame.
+    Class browserFrameClass = NSClassFromString(@"NSGrayFrame");
+    view_.reset([[browserFrameClass alloc] initWithFrame:frame]);
+  }
+
+  scoped_nsobject<NSView> view_;
+};
+
+//  Test to make sure our class modifications were successful.
+TEST_F(BrowserFrameViewTest, SuccessfulClassModifications) {
+  unsigned int count;
+  BOOL foundMouseInGroup = NO;
+  BOOL foundDrawRectOriginal = NO;
+  BOOL foundUpdateTrackingAreas = NO;
+
+  Method* methods = class_copyMethodList([view_ class], &count);
+  for (unsigned int i = 0; i < count; ++i) {
+    SEL selector = method_getName(methods[i]);
+    if (selector == @selector(_mouseInGroup:)) {
+      foundMouseInGroup = YES;
+    } else if (selector == @selector(drawRectOriginal:)) {
+      foundDrawRectOriginal = YES;
+    } else if (selector == @selector(updateTrackingAreas)) {
+      foundUpdateTrackingAreas = YES;
+    }
+  }
+  EXPECT_TRUE(foundMouseInGroup);
+  EXPECT_TRUE(foundDrawRectOriginal);
+  EXPECT_TRUE(foundUpdateTrackingAreas);
+  free(methods);
+}