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diff --git a/chrome/browser/ui/cocoa/web_drag_source.h b/chrome/browser/ui/cocoa/web_drag_source.h
new file mode 100644
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+++ b/chrome/browser/ui/cocoa/web_drag_source.h
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+// Copyright (c) 2009 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/file_path.h"
+#include "base/scoped_nsobject.h"
+#include "base/scoped_ptr.h"
+#include "googleurl/src/gurl.h"
+
+@class TabContentsViewCocoa;
+struct WebDropData;
+
+// A class that handles tracking and event processing for a drag and drop
+// originating from the content area.
+@interface WebDragSource : NSObject {
+ @private
+  // Our tab. Weak reference (owns or co-owns us).
+  TabContentsViewCocoa* contentsView_;
+
+  // Our drop data. Should only be initialized once.
+  scoped_ptr<WebDropData> dropData_;
+
+  // The image to show as drag image. Can be nil.
+  scoped_nsobject<NSImage> dragImage_;
+
+  // The offset to draw |dragImage_| at.
+  NSPoint imageOffset_;
+
+  // Our pasteboard.
+  scoped_nsobject<NSPasteboard> pasteboard_;
+
+  // A mask of the allowed drag operations.
+  NSDragOperation dragOperationMask_;
+
+  // The file name to be saved to for a drag-out download.
+  FilePath downloadFileName_;
+
+  // The URL to download from for a drag-out download.
+  GURL downloadURL_;
+}
+
+// Initialize a WebDragSource object for a drag (originating on the given
+// contentsView and with the given dropData and pboard). Fill the pasteboard
+// with data types appropriate for dropData.
+- (id)initWithContentsView:(TabContentsViewCocoa*)contentsView
+                  dropData:(const WebDropData*)dropData
+                     image:(NSImage*)image
+                    offset:(NSPoint)offset
+                pasteboard:(NSPasteboard*)pboard
+         dragOperationMask:(NSDragOperation)dragOperationMask;
+
+// Returns a mask of the allowed drag operations.
+- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal;
+
+// Call when asked to do a lazy write to the pasteboard; hook up to
+// -pasteboard:provideDataForType: (on the contentsView).
+- (void)lazyWriteToPasteboard:(NSPasteboard*)pboard
+                      forType:(NSString*)type;
+
+// Start the drag (on the originally provided contentsView); can do this right
+// after -initWithContentsView:....
+- (void)startDrag;
+
+// End the drag and clear the pasteboard; hook up to
+// -draggedImage:endedAt:operation:.
+- (void)endDragAt:(NSPoint)screenPoint
+        operation:(NSDragOperation)operation;
+
+// Drag moved; hook up to -draggedImage:movedTo:.
+- (void)moveDragTo:(NSPoint)screenPoint;
+
+// Call to drag a promised file to the given path (should be called before
+// -endDragAt:...); hook up to -namesOfPromisedFilesDroppedAtDestination:.
+// Returns the file name (not including path) of the file deposited (or which
+// will be deposited).
+- (NSString*)dragPromisedFileTo:(NSString*)path;
+
+@end