[Mac] Properly call setIsActive() when becoming and resigning key window.

webkit/tools/test_shell/mac/test_shell_webview.mm

 // Copyright (c) 2008 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 "test_shell_webview.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/gfx/rect.h"
 #include "base/scoped_ptr.h"
@@ skipping 178 matching lines @@
 
 - (BOOL)resignFirstResponder {
   if (shell_ && shell_->webView()) {
     shell_->webViewHost()->SetFocus(NO);
     return YES;
   }
 
   return NO;
 }
 
+- (void)setIsActive:(BOOL)active {
+  if (shell_ && shell_->webView())
+    shell_->webViewHost()->SetIsActive(active ? true : false);
+}
+
 - (void)setFrame:(NSRect)frameRect {
   [super setFrame:frameRect];
   if (shell_ && shell_->webView())
     shell_->webViewHost()->Resize(gfx::Rect(NSRectToCGRect(frameRect)));
   [self setNeedsDisplay:YES];
 }
 
 @end