[Extensions UI] Initially disabled OK button for extension install prompts.

chrome/browser/ui/cocoa/extensions/extension_install_view_controller_unittest.mm

 // Copyright (c) 2012 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/ui/cocoa/extensions/extension_install_view_controller.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <utility>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #import "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/ui/browser.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.h"
 #include "chrome/browser/ui/cocoa/test/cocoa_profile_test.h"
+#include "chrome/browser/ui/cocoa/test/run_loop_testing.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/permissions/permission_message_provider.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 
 using extensions::Extension;
 using extensions::PermissionIDSet;
 using extensions::PermissionMessage;
 using extensions::PermissionMessages;
 
@@ skipping 342 matching lines @@
   [controller view];  // Force nib load.
 
   NSOutlineView* outlineView = [controller outlineView];
   EXPECT_TRUE(outlineView);
   EXPECT_EQ(4, [outlineView numberOfRows]);
   EXPECT_NSEQ(base::SysUTF16ToNSString(permissionString),
               [[outlineView dataSource] outlineView:outlineView
                           objectValueForTableColumn:nil
                                              byItem:[outlineView itemAtRow:2]]);
 }
+
+// Test that install button is disabled for a short time period.
+TEST_F(ExtensionInstallViewControllerTest, DelayedInstalls) {
+  [ExtensionInstallViewController setInstallDelayForTesting:0];
+  MockExtensionInstallViewDelegate delegate;
+
+  std::unique_ptr<ExtensionInstallPrompt::Prompt> prompt(
+      chrome::BuildExtensionInstallPrompt(extension_.get()));
+
+  base::scoped_nsobject<ExtensionInstallViewController> controller(
+      [[ExtensionInstallViewController alloc]
+          initWithProfile:profile()
+                navigator:browser()
+                 delegate:&delegate
+                   prompt:std::move(prompt)]);
+
+  [controller view];  // Force nib load.
+
+  // Check initial button states.
+  NSButton* cancelButton_ = [controller cancelButton];
+  NSButton* okButton_ = [controller okButton];
+  EXPECT_TRUE([cancelButton_ isEnabled]);
+  EXPECT_FALSE([okButton_ isEnabled]);
+
+  // Check OK button state after timeout to verifiy that it is enabled.
+  chrome::testing::NSRunLoopRunAllPending();
+  EXPECT_TRUE([okButton_ isEnabled]);
+}