[ios Mojo] Supporting code for define WebUI function.

ios/web/test/web_test.mm

 // Copyright 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 "ios/web/test/web_test.h"
 
 #include <utility>
 
 #include "base/base64.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #import "base/test/ios/wait_util.h"
 #import "ios/testing/ocmock_complex_type_helper.h"
 #import "ios/web/navigation/crw_session_controller.h"
 #include "ios/web/public/active_state_manager.h"
 #include "ios/web/public/referrer.h"
+#include "ios/web/public/url_schemes.h"
 #import "ios/web/public/web_state/ui/crw_web_delegate.h"
 #import "ios/web/web_state/ui/crw_web_controller.h"
 #import "ios/web/web_state/web_state_impl.h"
 #include "third_party/ocmock/OCMock/OCMock.h"
 
 // Helper Mock to stub out API with C++ objects in arguments.
 @interface WebDelegateMock : OCMockComplexTypeHelper
 @end
 
 @implementation WebDelegateMock
 // Stub implementation always returns YES.
 - (BOOL)webController:(CRWWebController*)webController
         shouldOpenURL:(const GURL&)url
       mainDocumentURL:(const GURL&)mainDocumentURL
           linkClicked:(BOOL)linkClicked {
   return YES;
 }
 @end
 
 namespace web {
 
 #pragma mark -
 
-WebTest::WebTest() : web_client_(base::WrapUnique(new TestWebClient)) {}
+WebTest::WebTest() : web_client_(base::WrapUnique(new TestWebClient)) {
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    RegisterWebSchemes(true);
+  });
+}
+
 WebTest::~WebTest() {}
 
 void WebTest::SetUp() {
   PlatformTest::SetUp();
   BrowserState::GetActiveStateManager(&browser_state_)->SetActive(true);
 }
 
 void WebTest::TearDown() {
   BrowserState::GetActiveStateManager(&browser_state_)->SetActive(false);
   PlatformTest::TearDown();
@@ skipping 160 matching lines @@
   }
   return false;
 }
 
 NSString* WebTestWithWebController::CreateLoadCheck() {
   return [NSString stringWithFormat:@"<p style=\"display: none;\">%d</p>",
                                     s_html_load_count++];
 }
 
 }  // namespace web