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diff --git a/widget/cocoa/mozView.h b/widget/cocoa/mozView.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozView_h_
+#define mozView_h_
+
+#undef DARWIN
+#import <Cocoa/Cocoa.h>
+class nsIWidget;
+
+namespace mozilla {
+namespace widget {
+class TextInputHandler;
+}  // namespace widget
+}  // namespace mozilla
+
+// A protocol with some of the methods that ChildView implements. In the distant
+// past, this protocol was used by embedders: They would create their own NSView
+// subclass, implement mozView on it, and then embed a Gecko ChildView by adding
+// it as a subview of this view. This scenario no longer exists.
+// Now this protocol is mostly just used by TextInputHandler and mozAccessible
+// in order to communicate with ChildView without seeing the entire ChildView
+// interface definition.
+@protocol mozView
+
+// aHandler is Gecko's default text input handler:  It implements the
+// NSTextInput protocol to handle key events.  Don't make aHandler a
+// strong reference -- that causes a memory leak.
+- (void)installTextInputHandler:(mozilla::widget::TextInputHandler*)aHandler;
+- (void)uninstallTextInputHandler;
+
+// access the nsIWidget associated with this view. DOES NOT ADDREF.
+- (nsIWidget*)widget;
+
+// called when our corresponding Gecko view goes away
+- (void)widgetDestroyed;
+
+- (BOOL)isDragInProgress;
+
+// Checks whether the view is first responder or not
+- (BOOL)isFirstResponder;
+
+// Call when you dispatch an event which may cause to open context menu.
+- (void)maybeInitContextMenuTracking;
+
+@end
+
+// An informal protocol implemented by the NSWindow of the host application.
+//
+// It's used to prevent re-entrant calls to -makeKeyAndOrderFront: when gecko
+// focus/activate events propagate out to the embedder's
+// nsIEmbeddingSiteWindow::SetFocus implementation.
+@interface NSObject (mozWindow)
+
+- (BOOL)suppressMakeKeyFront;
+- (void)setSuppressMakeKeyFront:(BOOL)inSuppress;
+
+@end
+
+#endif  // mozView_h_