alternate ntp: implement searchbox api for instant overlay to adopt themes

chrome/common/instant_types.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 "chrome/common/instant_types.h"
 
 InstantSuggestion::InstantSuggestion()
     : behavior(INSTANT_COMPLETE_NOW),
       type(INSTANT_SUGGESTION_SEARCH) {
 }
 
 InstantSuggestion::InstantSuggestion(const string16& in_text,
                                      InstantCompleteBehavior in_behavior,
                                      InstantSuggestionType in_type)
     : text(in_text),
       behavior(in_behavior),
       type(in_type) {
 }
 
 InstantSuggestion::~InstantSuggestion() {
 }
 
 InstantAutocompleteResult::InstantAutocompleteResult() : relevance(0) {
 }
 
 InstantAutocompleteResult::~InstantAutocompleteResult() {
 }
+
+ThemeBackgroundInfo::ThemeBackgroundInfo() : image_height(0) {
+}
+
+ThemeBackgroundInfo::~ThemeBackgroundInfo() {
+}