Refactor [FramedBrowserWindow drawWindowThemeInDirtyRect:] to use themeImagePositionForAlignment:

chrome/browser/ui/cocoa/themed_window.h

Index: chrome/browser/ui/cocoa/themed_window.h
diff --git a/chrome/browser/ui/cocoa/themed_window.h b/chrome/browser/ui/cocoa/themed_window.h
index f55379527877668b9ef1bc91aa2da5fbdcf84eb2..592e56722ae9d984e2bcc39d2e5553bbba4afd98 100644
--- a/chrome/browser/ui/cocoa/themed_window.h
+++ b/chrome/browser/ui/cocoa/themed_window.h
@@ -22,13 +22,13 @@ enum {
 typedef NSUInteger ThemedWindowStyle;
 
 // Indicates how the theme image should be aligned.
-enum ThemePatternAlignment {
+enum ThemeImageAlignment {
   // Aligns the top of the theme image with the top of the frame. Use this
   // for IDR_THEME_THEME_FRAME.*
-  THEME_PATTERN_ALIGN_WITH_FRAME,
-  // Aligns the top of the theme image with the top of the tab
-  // strip. Use this for IDR_THEME_TAB_BACKGROUND and IDR_THEME_TOOLBAR.
-  THEME_PATTERN_ALIGN_WITH_TAB_STRIP
+  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.
@@ -36,7 +36,13 @@ enum ThemePatternAlignment {
 @interface NSWindow (ThemeProvider)
 - (ThemeProvider*)themeProvider;
 - (ThemedWindowStyle)themedWindowStyle;
-- (NSPoint)themePatternPhaseForAlignment:(ThemePatternAlignment)alignment;
+
+// 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
 
 #endif  // CHROME_BROWSER_UI_COCOA_THEMED_WINDOW_H_