Upstream ios/web/web_state/ui support classes

ios/web/web_state/ui/crw_swipe_recognizer_provider.h

Index: ios/web/web_state/ui/crw_swipe_recognizer_provider.h
diff --git a/ios/web/web_state/ui/crw_swipe_recognizer_provider.h b/ios/web/web_state/ui/crw_swipe_recognizer_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..291fff36493ccd4a8e37079c8a8c5df129cd85ed
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+++ b/ios/web/web_state/ui/crw_swipe_recognizer_provider.h
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+// Copyright 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.
+
+#ifndef IOS_WEB_WEB_STATE_UI_CRW_SWIPE_RECOGNIZER_PROVIDER_H_
+#define IOS_WEB_WEB_STATE_UI_CRW_SWIPE_RECOGNIZER_PROVIDER_H_
+
+#import <UIKit/UIKit.h>
+
+// A protocol implemented by a provider of swipe recognizers for a web view.
+@protocol CRWSwipeRecognizerProvider
+
+// Returns set of UIGestureRecognizer objects.
+- (NSSet*)swipeRecognizers;
+
+@end
+
+#endif  // IOS_WEB_WEB_STATE_UI_CRW_SWIPE_RECOGNIZER_PROVIDER_H_