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diff --git a/content/browser/web_contents/web_drag_dest_mac.h b/content/browser/web_contents/web_drag_dest_mac.h
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+++ b/content/browser/web_contents/web_drag_dest_mac.h
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+// Copyright (c) 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.
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/string16.h"
+
+class WebContentsImpl;
+struct WebDropData;
+
+namespace content {
+class RenderViewHost;
+class WebDragDestDelegate;
+}
+
+// A typedef for a RenderViewHost used for comparison purposes only.
+typedef content::RenderViewHost* RenderViewHostIdentifier;
+
+// A class that handles tracking and event processing for a drag and drop
+// over the content area. Assumes something else initiates the drag, this is
+// only for processing during a drag.
+
+@interface WebDragDest : NSObject {
+ @private
+  // Our associated WebContentsImpl. Weak reference.
+  WebContentsImpl* webContents_;
+
+  // Delegate; weak.
+  content::WebDragDestDelegate* delegate_;
+
+  // Updated asynchronously during a drag to tell us whether or not we should
+  // allow the drop.
+  NSDragOperation current_operation_;
+
+  // Keep track of the render view host we're dragging over.  If it changes
+  // during a drag, we need to re-send the DragEnter message.
+  RenderViewHostIdentifier currentRVH_;
+}
+
+// |contents| is the WebContentsImpl representing this tab, used to communicate
+// drag&drop messages to WebCore and handle navigation on a successful drop
+// (if necessary).
+- (id)initWithWebContentsImpl:(WebContentsImpl*)contents;
+
+- (void)setDragDelegate:(content::WebDragDestDelegate*)delegate;
+
+// Sets the current operation negotiated by the source and destination,
+// which determines whether or not we should allow the drop. Takes effect the
+// next time |-draggingUpdated:| is called.
+- (void)setCurrentOperation:(NSDragOperation)operation;
+
+// Messages to send during the tracking of a drag, ususally upon receiving
+// calls from the view system. Communicates the drag messages to WebCore.
+- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)info
+                              view:(NSView*)view;
+- (void)draggingExited:(id<NSDraggingInfo>)info;
+- (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)info
+                              view:(NSView*)view;
+- (BOOL)performDragOperation:(id<NSDraggingInfo>)info
+                              view:(NSView*)view;
+
+@end
+
+// Public use only for unit tests.
+@interface WebDragDest(Testing)
+// Given |data|, which should not be nil, fill it in using the contents of the
+// given pasteboard.
+- (void)populateWebDropData:(WebDropData*)data
+             fromPasteboard:(NSPasteboard*)pboard;
+// Given a point in window coordinates and a view in that window, return a
+// flipped point in the coordinate system of |view|.
+- (NSPoint)flipWindowPointToView:(const NSPoint&)windowPoint
+                            view:(NSView*)view;
+// Given a point in window coordinates and a view in that window, return a
+// flipped point in screen coordinates.
+- (NSPoint)flipWindowPointToScreen:(const NSPoint&)windowPoint
+                              view:(NSView*)view;
+@end