[ios] Added DialogsSuppression public API to WebState.

ios/web/public/test/test_web_state.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/public/test/test_web_state.h"
 
 #include <stdint.h>
 
 #include "base/callback.h"
 
@@ skipping 18 matching lines @@
 }
 
 bool TestWebState::IsWebUsageEnabled() const {
   return web_usage_enabled_;
 }
 
 void TestWebState::SetWebUsageEnabled(bool enabled) {
   web_usage_enabled_ = enabled;
 }
 
+bool TestWebState::ShouldSuppressDialogs() const {
+  return false;
+}
+
+void TestWebState::SetShouldSuppressDialogs(bool should_suppress) {}
+
 UIView* TestWebState::GetView() {
   return nullptr;
 }
 
 const NavigationManager* TestWebState::GetNavigationManager() const {
   return nullptr;
 }
 
 NavigationManager* TestWebState::GetNavigationManager() {
   return nullptr;
@@ skipping 94 matching lines @@
 shell::InterfaceRegistry* TestWebState::GetMojoInterfaceRegistry() {
   return nullptr;
 }
 
 base::WeakPtr<WebState> TestWebState::AsWeakPtr() {
   NOTREACHED();
   return base::WeakPtr<WebState>();
 }
 
 }  // namespace web