[mac] In app windows, calculate the window corner radius programmatically.

chrome/browser/ui/cocoa/extensions/shell_window_cocoa.mm

 // Copyright (c) 2012 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/ui/cocoa/extensions/shell_window_cocoa.h"
 
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/cocoa/browser_window_utils.h"
@@ skipping 38 matching lines @@
 }
 
 @end
 
 @interface ShellNSWindow : UnderlayOpenGLHostingWindow
 
 - (void)drawCustomFrameRect:(NSRect)rect forView:(NSView*)view;
 
 @end
 
+// This is really a method on NSGrayFrame, so it should only be called on the
+// view passed into -[NSWindow drawCustomFrameRect:forView:].
+@interface NSView (PrivateMethods)
+- (CGFloat)roundedCornerRadius;
+@end
+
 @implementation ShellNSWindow
 
 - (void)drawCustomFrameRect:(NSRect)rect forView:(NSView*)view {
   [[NSBezierPath bezierPathWithRect:rect] addClip];
   [[NSColor clearColor] set];
   NSRectFill(rect);
-  const CGFloat kWindowBorderRadius = 3.0;
+
+  // Set up our clip.
+  CGFloat cornerRadius = 4.0;
+  if ([view respondsToSelector:@selector(roundedCornerRadius)])
+    cornerRadius = [view roundedCornerRadius];
   [[NSBezierPath bezierPathWithRoundedRect:[view bounds]
-                                   xRadius:kWindowBorderRadius
-                                   yRadius:kWindowBorderRadius] addClip];
+                                   xRadius:cornerRadius
+                                   yRadius:cornerRadius] addClip];
   [[NSColor whiteColor] set];
   NSRectFill(rect);
 }
 
 @end
 
 ShellWindowCocoa::ShellWindowCocoa(Profile* profile,
                                    const extensions::Extension* extension,
                                    const GURL& url,
                                    const ShellWindow::CreateParams& params)
@@ skipping 235 matching lines @@
   return [window_controller_ window];
 }
 
 // static
 ShellWindow* ShellWindow::CreateImpl(Profile* profile,
                                      const extensions::Extension* extension,
                                      const GURL& url,
                                      const ShellWindow::CreateParams& params) {
   return new ShellWindowCocoa(profile, extension, url, params);
 }