Add background_tile_view for tiling an image as UI background (about box need...

chrome/browser/cocoa/background_tile_view.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.
+
+#include "chrome/browser/cocoa/background_tile_view.h"
+
+@implementation BackgroundTileView
+@synthesize tileImage = tileImage_;
+
+- (void)setTileImage:(NSImage*)tileImage {
+  [tileImage_ autorelease];
+  tileImage_ = [tileImage retain];
+  [self setNeedsDisplay:YES];
+}
+
+- (void)drawRect:(NSRect)rect {
+  // Tile within the view, so set the phase to start at the view bottom.
+  NSPoint phase = NSMakePoint(0.0, NSMinY([self frame]));
+  [[NSGraphicsContext currentContext] setPatternPhase:phase];
+
+  if (tileImage_) {
+    NSColor *color = [NSColor colorWithPatternImage:tileImage_];
+    [color set];
+  } else {
+    // Something to catch the missing image
+    [[NSColor magentaColor] set];
+  }
+
+  NSRectFill([self bounds]);
+}
+
+@end