Mac: Make it easier for views to correctly draw with a theme.

chrome/browser/ui/cocoa/themed_window.h

 // Copyright (c) 2010 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_THEMED_WINDOW_H_
 #define CHROME_BROWSER_UI_COCOA_THEMED_WINDOW_H_
 
 #import <Cocoa/Cocoa.h>
 
 namespace ui {
@@ skipping 14 matching lines @@
 enum ThemeImageAlignment {
   // Aligns the top of the theme image with the top of the frame. Use this
   // for IDR_THEME_THEME_FRAME.*
   THEME_IMAGE_ALIGN_WITH_FRAME,
   // Aligns the top of the theme image with the top of the tabs.
   // Use this for IDR_THEME_TAB_BACKGROUND and IDR_THEME_TOOLBAR.
   THEME_IMAGE_ALIGN_WITH_TAB_STRIP
 };
 
 // Implemented by windows that support theming.
-
 @interface NSWindow (ThemeProvider)
 - (ThemeProvider*)themeProvider;
 - (ThemedWindowStyle)themedWindowStyle;
 
 // Returns the position in the coordinates of the root view
 // ([[self contentView] superview]) that the top left of a theme image with
 // |alignment| should be painted at. The result of this method can be used in
 // conjunction with [NSGraphicsContext cr_setPatternPhase:] to set the offset of
 // pattern colors.
 - (NSPoint)themeImagePositionForAlignment:(ThemeImageAlignment)alignment;
 @end
 
+// Adopted by views that want to redraw when the theme changed, or when the
+// window's active status changed.
+@protocol ThemedWindowDrawing
+
+// Called by the window controller when the theme changed.
+- (void)windowDidChangeTheme;
+
+// Called by the window controller when the window gained or lost main window
+// status.
+- (void)windowDidChangeActive;
+
+@end
+
 #endif  // CHROME_BROWSER_UI_COCOA_THEMED_WINDOW_H_