Drag-and-drop: Target drag messages (the sequel).

content/browser/web_contents/web_drag_source_mac.h

 // 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 <memory>
 
 #include "base/files/file_path.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsobject.h"
+#include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "url/gurl.h"
 
 namespace content {
+class RenderWidgetHostImpl;
 class WebContentsImpl;
 struct DropData;
 }
 
 // A class that handles tracking and event processing for a drag and drop
 // originating from the content area.
 CONTENT_EXPORT
 @interface WebDragSource : NSObject {
  @private
   // Our contents. Weak reference (owns or co-owns us).
@@ skipping 22 matching lines @@
   NSDragOperation dragOperationMask_;
 
   // The file name to be saved to for a drag-out download.
   base::FilePath downloadFileName_;
 
   // The URL to download from for a drag-out download.
   GURL downloadURL_;
 
   // The file UTI associated with the file drag, if any.
   base::ScopedCFTypeRef<CFStringRef> fileUTI_;
+
+  // Tracks the RenderWidgetHost where the current drag started.
+  base::WeakPtr<content::RenderWidgetHostImpl> dragStartRWH_;
 }
 
 // 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)initWithContents:(content::WebContentsImpl*)contents
                   view:(NSView*)contentsView
               dropData:(const content::DropData*)dropData
+             sourceRWH:(content::RenderWidgetHostImpl*)sourceRWH
                  image:(NSImage*)image
                 offset:(NSPoint)offset
             pasteboard:(NSPasteboard*)pboard
      dragOperationMask:(NSDragOperation)dragOperationMask;
 
 // Call when the web contents is gone.
 - (void)clearWebContentsView;
 
 // Returns a mask of the allowed drag operations.
 - (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal;
@@ skipping 12 matching lines @@
 - (void)endDragAt:(NSPoint)screenPoint
         operation:(NSDragOperation)operation;
 
 // 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