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

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

Index: ios/chrome/browser/ui/contextual_search/contextual_search_mask_view.h
diff --git a/ios/chrome/browser/ui/contextual_search/contextual_search_mask_view.h b/ios/chrome/browser/ui/contextual_search/contextual_search_mask_view.h
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index 0000000000000000000000000000000000000000..4091121173bec14a71a66aaedd141ba024e06a46
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+++ b/ios/chrome/browser/ui/contextual_search/contextual_search_mask_view.h
@@ -0,0 +1,26 @@
+// 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 IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_MASK_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_MASK_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/contextual_search/contextual_search_panel_protocols.h"
+
+@interface ContextualSearchMaskView
+    : UIView<ContextualSearchPanelMotionObserver>
+
+// Create a mask view. It will szie itself to cover its superview, and will
+// adjust its opacity in response to the motion of the panel it observes.
+
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithCoder:(NSCoder*)aDecoder NS_UNAVAILABLE;
+
+- (instancetype)initWithFrame:(CGRect)frame NS_UNAVAILABLE;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_CONTEXTUAL_SEARCH_CONTEXTUAL_SEARCH_MASK_VIEW_H_