Upstream Chrome on iOS source code [4/11].

ios/chrome/browser/ui/contextual_search/contextual_search_results_view.h

+// Copyright 2016 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_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_RESULTS_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_RESULTS_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/contextual_search/contextual_search_controller.h"
+#import "ios/chrome/browser/ui/contextual_search/contextual_search_panel_protocols.h"
+#import "url/gurl.h"
+
+@class Tab;
+
+@protocol ContextualSearchTabPromoter<NSObject>
+// Expand the search results displayed in the tab retrieved by |tabRetriever| to
+// a new tab, dismissing the panel. If |headerPressed| is YES, then this is
+// happening because of a tap on the header view. Otherwise, this is because of
+// navigation inside the search view.
+- (void)promoteTabHeaderPressed:(BOOL)headerPressed;
+@end
+
+@protocol ContextualSearchPreloadChecker<NSObject>
+// YES if it's OK to preload search results.
+- (BOOL)canPreloadSearchResults;
+@end
+
+@interface ContextualSearchResultsView
+    : UIView<ContextualSearchPanelMotionObserver,
+             ContextualSearchPanelScrollSynchronizer,
+             ContextualSearchTabProvider>
+@property(nonatomic, assign) BOOL active;
+// The tab that is credited with opening the search results tab.
+@property(nonatomic, assign) Tab* opener;
+// Object that can handle promoting the search results.
+@property(nonatomic, assign) id<ContextualSearchTabPromoter> promoter;
+// Object that can determine if search results can be preloaded.
+@property(nonatomic, assign) id<ContextualSearchPreloadChecker> preloadChecker;
+// YES if the search results have loaded and this view was visible.
+@property(nonatomic, readonly) BOOL contentVisible;
+
+// Creates an new (internal) Tab object loading |url|; if |preloadEnabled| is
+// YES, then this tab will start loading as soon as possible, otherwise it will
+// start loading as soon as this view becomes visible.
+- (void)createTabForSearch:(GURL)url preloadEnabled:(BOOL)preloadEnabled;
+
+// Scroll the search results tab content so the top of the loaded page is
+// visible.
+- (void)scrollToTopAnimated:(BOOL)animated;
+
+// Record metrics for the loaded search results having finished, marking them
+// as 'chained' or not according to |chained|.
+- (void)recordFinishedSearchChained:(BOOL)chained;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_RESULTS_VIEW_H_