Refactor [FramedBrowserWindow drawWindowThemeInDirtyRect:] to use themeImagePositionForAlignment:

chrome/browser/ui/cocoa/browser_window_controller.h

Index: chrome/browser/ui/cocoa/browser_window_controller.h
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.h b/chrome/browser/ui/cocoa/browser_window_controller.h
index e0dbaced8af0384b84837e7d1c14a3b7467f8eeb..e7e68b019c912ad2b58bf8845e6aee1c7adfa221 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.h
+++ b/chrome/browser/ui/cocoa/browser_window_controller.h
@@ -311,9 +311,13 @@ class WebContents;
 // Gets the window style.
 - (ThemedWindowStyle)themedWindowStyle;
 
-// Returns the pattern phase for |alignment|. If the window does not have a tab
-// strip, the phase for THEME_PATTERN_ALIGN_WITH_FRAME is always returned.
-- (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. If the window does not have a tab strip,
+// the offset for THEME_IMAGE_ALIGN_WITH_FRAME is always returned. 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;
 
 // Return the point to which a bubble window's arrow should point, in window
 // coordinates.