[ios] Added DialogsSuppression public API to WebState.

ios/web/web_state/web_state_impl_unittest.mm

 // Copyright 2014 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.
 
 #include "ios/web/web_state/web_state_impl.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 278 matching lines @@
 
   web_state_->SetWebUsageEnabled(true);
   EXPECT_TRUE(web_state_->IsWebUsageEnabled());
   EXPECT_TRUE(web_state_->GetWebController().webUsageEnabled);
 
   web_state_->SetWebUsageEnabled(false);
   EXPECT_FALSE(web_state_->IsWebUsageEnabled());
   EXPECT_FALSE(web_state_->GetWebController().webUsageEnabled);
 }
 
+TEST_F(WebStateTest, ShouldSuppressDialogs) {
+  // Default is false.
+  ASSERT_FALSE(web_state_->ShouldSuppressDialogs());
+
+  web_state_->SetShouldSuppressDialogs(true);
+  EXPECT_TRUE(web_state_->ShouldSuppressDialogs());
+  EXPECT_TRUE(web_state_->GetWebController().shouldSuppressDialogs);
+
+  web_state_->SetShouldSuppressDialogs(false);
+  EXPECT_FALSE(web_state_->ShouldSuppressDialogs());
+  EXPECT_FALSE(web_state_->GetWebController().shouldSuppressDialogs);
+}
+
 TEST_F(WebStateTest, ResponseHeaders) {
   GURL real_url("http://foo.com/bar");
   GURL frame_url("http://frames-r-us.com/");
   scoped_refptr<net::HttpResponseHeaders> real_headers(HeadersFromString(
       "HTTP/1.1 200 OK\r\n"
       "Content-Type: text/html\r\n"
       "Content-Language: en\r\n"
       "X-Should-Be-Here: yep\r\n"
       "\r\n"));
   scoped_refptr<net::HttpResponseHeaders> frame_headers(HeadersFromString(
@@ skipping 316 matching lines @@
       "</script>");
 
   base::test::ios::WaitUntilCondition(^{
     return message_received;
   });
   web_state_->RemoveScriptCommandCallback("test");
 }
 
 }  // namespace
 }  // namespace web