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

ios/chrome/browser/ui/contextual_search/contextual_search_highlighter_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_HIGHLIGHTER_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_HIGHLIGHTER_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+@protocol ContextualSearchHighlighterDelegate
+
+// Redraw the highlight rects. This method does not change which text is
+// highlighted but updates the highlighting in case the text has moved.
+- (void)updateHighlight;
+
+@end
+
+// A view containing semitransparent rects to highlight searched terms.
+@interface ContextualSearchHighlighterView : UIView
+
+// Designated initializer.
+// |owner updateHighlight| will be called when the view size change.
+- (instancetype)initWithFrame:(CGRect)frame
+                     delegate:(id<ContextualSearchHighlighterDelegate>)delegate
+    NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithFrame:(CGRect)frame NS_UNAVAILABLE;
+- (instancetype)initWithCoder:(NSCoder*)aDecoder NS_UNAVAILABLE;
+
+// Creates the highlights in |rect|. |offset| is vertically applied to all
+// rects. |scroll| is store to compute the delta scroll on subsequent calls to
+// |setScroll|.
+- (void)highlightRects:(NSArray*)rects
+            withOffset:(CGFloat)offset
+                  zoom:(CGFloat)zoom
+                scroll:(CGPoint)scroll;
+
+// Offset all highlighted rects by the delta between |scroll| and the previous
+// value of |scroll|.
+- (void)setScroll:(CGPoint)scroll zoom:(CGFloat)zoom offset:(CGFloat)offset;
+
+- (CGRect)boundingRect;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_HIGHLIGHTER_VIEW_H_