Add GetOriginalRequestURL() to NavigationItem interface.

ios/web/navigation/navigation_item_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.
 
 #import "ios/web/navigation/navigation_item_impl.h"
 
 #include <memory>
 
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 namespace web {
 namespace {
 
+const char kItemURLString[] = "http://init.test";
 static NSString* const kHTTPHeaderKey1 = @"key1";
 static NSString* const kHTTPHeaderKey2 = @"key2";
 static NSString* const kHTTPHeaderValue1 = @"value1";
 static NSString* const kHTTPHeaderValue2 = @"value2";
 
 class NavigationItemTest : public PlatformTest {
  protected:
   void SetUp() override {
     item_.reset(new web::NavigationItemImpl());
-    item_->SetURL(GURL("http://init.test"));
+    item_->SetOriginalRequestURL(GURL(kItemURLString));
+    item_->SetURL(GURL(kItemURLString));
     item_->SetTransitionType(ui::PAGE_TRANSITION_AUTO_BOOKMARK);
     item_->SetTimestamp(base::Time::Now());
     item_->AddHttpRequestHeaders(@{kHTTPHeaderKey1 : kHTTPHeaderValue1});
     item_->SetPostData([@"Test data" dataUsingEncoding:NSUTF8StringEncoding]);
   }
 
   // The NavigationItemImpl instance being tested.
   std::unique_ptr<NavigationItemImpl> item_;
 };
 
@@ skipping 63 matching lines @@
   EXPECT_NSEQ(httpHeaders, item_->GetHttpRequestHeaders());
 
   item_->RemoveHttpRequestHeaderForKey(kHTTPHeaderKey1);
   EXPECT_NSEQ(@{kHTTPHeaderKey2 : kHTTPHeaderValue2},
               item_->GetHttpRequestHeaders());
 
   item_->RemoveHttpRequestHeaderForKey(kHTTPHeaderKey2);
   EXPECT_FALSE(item_->GetHttpRequestHeaders());
 }
 
+// Tests the getter, setter, and copy constructor for the original request URL.
+TEST_F(NavigationItemTest, OriginalURL) {
+  GURL original_url = GURL(kItemURLString);
+  EXPECT_EQ(original_url, item_->GetOriginalRequestURL());
+  web::NavigationItemImpl copy(*item_);
+  GURL new_url = GURL("http://new_url.test");
+  item_->SetOriginalRequestURL(new_url);
+  EXPECT_EQ(new_url, item_->GetOriginalRequestURL());
+  EXPECT_EQ(original_url, copy.GetOriginalRequestURL());
+}
+
 }  // namespace
 }  // namespace web