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

ios/public/provider/chrome/browser/search_provider.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_PUBLIC_PROVIDER_CHROME_BROWSER_SEARCH_PROVIDER_H_
-#define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SEARCH_PROVIDER_H_
-
-#include <string>
-
-#include "base/macros.h"
-
-namespace ios {
-
-// SearchProvider provides accessor for search features not yet componentized.
-class SearchProvider {
- public:
-  SearchProvider() {}
-  virtual ~SearchProvider() {}
-
-  // Returns whether query extraction is enabled.
-  virtual bool IsQueryExtractionEnabled() = 0;
-
-  // Returns a string indicating whether InstantExtended is enabled, suitable
-  // for adding as a query parameter to the search requests. Returns an empty
-  // string otherwise.
-  //
-  // |for_search| should be set to true for search requests, in which case this
-  // returns a non-empty string only if query extraction is enabled.
-  virtual std::string InstantExtendedEnabledParam(bool for_search) = 0;
-
-  // Returns a string that will cause the search results page to update
-  // incrementally. Currently, Instant Extended passes a different param to
-  // search results pages that also has this effect, so by default this function
-  // returns the empty string when Instant Extended is enabled. However, when
-  // doing instant search result prerendering, we still need to pass this param,
-  // as Instant Extended does not cause incremental updates by default for the
-  // prerender page. Callers should set |for_prerender| in this case to force
-  // the returned string to be non-empty.
-  virtual std::string ForceInstantResultsParam(bool for_prerender) = 0;
-
-  // Returns the start-edge margin of the omnibox in pixels.
-  virtual int OmniboxStartMargin() = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SearchProvider);
-};
-
-}  // namespace
-
-#endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SEARCH_PROVIDER_H_