Partially componentize //chrome/browser/search/search.{h,cc}

ios/chrome/browser/search/search_util.h

+// Copyright 2015 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.
+
+#ifndef IOS_CHROME_BROWSER_SEARCH_SEARCH_UTIL_H_
+#define IOS_CHROME_BROWSER_SEARCH_SEARCH_UTIL_H_
+
+#include "base/strings/string16.h"
+
+class GURL;
+
+namespace ios {
+class ChromeBrowserState;
+}
+
+namespace web {
+class WebState;
+}
+
+// Extracts and returns search terms from |url|. Does not consider
+// IsQueryExtractionEnabled() and Instant support state of the page and does
+// not check for a privileged process, so most callers should use
+// GetSearchTerms() below instead.
+base::string16 ExtractSearchTermsFromURL(ios::ChromeBrowserState* browser_state,
+                                         const GURL& url);
+
+// Returns true if it is okay to extract search terms from |url|. |url| must
+// have a secure scheme and must contain the search terms replacement key for
+// the default search provider.
+bool IsQueryExtractionAllowedForURL(ios::ChromeBrowserState* browser_state,
+                                    const GURL& url);
+
+// Returns search terms if this WebState is a search results page. It looks
+// in the visible NavigationItem first, to see if search terms have already
+// been extracted. Failing that, it tries to extract search terms from the URL.
+//
+// Returns a blank string if search terms were not found, or if search terms
+// extraction is disabled for this WebState or BrowserState, or if |web_state|
+// does not support Instant.
+base::string16 GetSearchTerms(web::WebState* web_state);
+
+#endif  // IOS_CHROME_BROWSER_SEARCH_SEARCH_UTIL_H_