[Search] Store and recall search terms using NavigationEntry to improve search term extraction

content/browser/web_contents/navigation_entry_impl.cc

 // 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.
 
 #include "content/browser/web_contents/navigation_entry_impl.h"
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/url_constants.h"
@@ skipping 261 matching lines @@
 }
 
 void NavigationEntryImpl::SetFrameToNavigate(const std::string& frame_name) {
   frame_to_navigate_ = frame_name;
 }
 
 const std::string& NavigationEntryImpl::GetFrameToNavigate() const {
   return frame_to_navigate_;
 }
 
+void NavigationEntryImpl::SetExtraData(const std::string& key,
+                                       const string16& data) {
+  extra_data_[key] = data;
+}
+
+bool NavigationEntryImpl::GetExtraData(const std::string& key,
+                                       string16* data) const {
+  std::map<std::string, string16>::const_iterator iter = extra_data_.find(key);
+  if (iter == extra_data_.end())
+    return false;
+  *data = iter->second;
+  return true;
+}
+
+void NavigationEntryImpl::ClearExtraData(const std::string& key) {
+  extra_data_.erase(key);
+}
+
 void NavigationEntryImpl::SetScreenshotPNGData(
     const std::vector<unsigned char>& png_data) {
   screenshot_ = png_data.empty() ? NULL : new base::RefCountedBytes(png_data);
 }
 
 }  // namespace content