[Autofill] Add basic version of GridLayout

chrome/browser/ui/cocoa/autofill/layout_view.h

+// Copyright (c) 2013 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.
+
+#ifndef CHROME_BROWSER_UI_COCOA_AUTOFILL_LAYOUT_VIEW_H_
+#define CHROME_BROWSER_UI_COCOA_AUTOFILL_LAYOUT_VIEW_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/memory/scoped_ptr.h"
+
+class SimpleGridLayout;
+
+// A view that carries its own layout manager. Re-layouts on setFrame:.
+@interface LayoutView : NSView {
+ @private
+  scoped_ptr<SimpleGridLayout> layout_;
+}
+
+// Sets a layout manager and takes ownership of it.
+- (void)setLayoutManager:(scoped_ptr<SimpleGridLayout>)layout;
+
+// Return a pointer to layout manager, still owned by the view.
+- (SimpleGridLayout*)layoutManager;
+
+// Re-layout subviews according to layout manager.
+- (void)performLayout;
+
+// Query the layout manager for the best height for specified |width|.
+- (CGFloat)preferredHeightForWidth:(CGFloat)width;
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_AUTOFILL_LAYOUT_VIEW_H_