[TTS] Gather surrounding text on Tap before any UX.

chrome/browser/android/contextualsearch/contextual_search_context.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 CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_CONTEXT_H_
 #define CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_CONTEXT_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "url/gurl.h"
 
 // Encapsulates key parts of a Contextual Search Context, including surrounding
 // text.
 struct ContextualSearchContext {
  public:
   ContextualSearchContext(const std::string& selected_text,
                           const bool use_resolved_search_term,
                           const GURL& page_url,
                           const std::string& encoding);
+  ContextualSearchContext(const bool use_resolved_search_term,
+                          const GURL& page_url,
+                          const std::string& encoding);
   ~ContextualSearchContext();
 
-  const std::string selected_text;
   const bool use_resolved_search_term;
   const GURL page_url;
   const std::string encoding;
 
+  std::string selected_text;
   base::string16 surrounding_text;
   int start_offset;
   int end_offset;
 
   DISALLOW_COPY_AND_ASSIGN(ContextualSearchContext);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_CONTEXT_H_