mac: New asset for the tabstrip border, tweak drawing.

chrome/browser/ui/cocoa/tabs/tab_view.h

 // Copyright (c) 2011 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_TABS_TAB_VIEW_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_VIEW_H_
 
 #import <Cocoa/Cocoa.h>
 #include <ApplicationServices/ApplicationServices.h>
 
@@ skipping 12 matching lines @@
 // This is more complicated than a simple on/off since we want to allow the
 // alert glow to go through a full rise-hold-fall cycle to avoid flickering (or
 // always holding).
 enum AlertState {
   kAlertNone = 0,  // Obj-C initializes to this.
   kAlertRising,
   kAlertHolding,
   kAlertFalling
 };
 
+// When the window doesn't have focus then we want to draw the button with a
+// slightly lighter color. We do this by just reducing the alpha.
+const CGFloat kImageNoFocusAlpha = 0.65;
+
 }  // namespace tabs
 
 @class TabController, TabWindowController;
 
 // A view that handles the event tracking (clicking and dragging) for a tab
 // on the tab strip. Relies on an associated TabController to provide a
 // target/action for selecting the tab.
 
 @interface TabView : NSView {
  @private
@@ skipping 68 matching lines @@
 
 // The TabController |controller_| is not the only owner of this view. If the
 // controller is released before this view, then we could be hanging onto a
 // garbage pointer. To prevent this, the TabController uses this interface to
 // clear the |controller_| pointer when it is dying.
 @interface TabView (TabControllerInterface)
 - (void)setController:(TabController*)controller;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_VIEW_H_