Allow opacity in themes.

chrome/browser/cocoa/browser_window_controller.mm

 // 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.
 
 #import "chrome/browser/cocoa/browser_window_controller.h"
 
 #include <Carbon/Carbon.h>
 
 #include "app/l10n_util_mac.h"
 #include "base/mac_util.h"
@@ skipping 251 matching lines @@
                                  ofType:@"nib"];
   if ((self = [super initWithWindowNibPath:nibpath owner:self])) {
     DCHECK(browser);
     initializing_ = YES;
     browser_.reset(browser);
     ownsBrowser_ = ownIt;
     tabObserver_.reset(
         new TabStripModelObserverBridge(browser->tabstrip_model(), self));
     NSWindow* window = [self window];
     windowShim_.reset(new BrowserWindowCocoa(browser, self, window));
-
+    [window setOpaque:NO];  // for themes wanting to play with opacity

[Robert Sesek, 2010/02/09 21:49:56]

Make this a full-stop sentence.

 
     // Sets the window to not have rounded corners, which prevents
     // the resize control from being inset slightly and looking ugly.
     if ([window respondsToSelector:@selector(setBottomCornerRounded:)])
       [window setBottomCornerRounded:NO];
 
     [self setTheme];
 
     // Get the most appropriate size for the window, then enforce the
     // minimum width and height. The window shim will handle flipping
@@ skipping 2054 matching lines @@
   if (frameOverlayInactiveImage) {
     [theme setValue:frameOverlayInactiveImage
        forAttribute:@"overlay"
               style:GTMThemeStyleWindow
               state:GTMThemeStateInactiveWindow];
   }
 
   return theme;
 }
 @end