Plumb the DragOperation through all the layers between the platform DnD code ...

chrome/browser/cocoa/web_drag_source.mm

 // 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 "chrome/browser/cocoa/web_drag_source.h"
 
 #include "base/file_util.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/task.h"
@@ skipping 104 matching lines @@
 - (void)fillPasteboard;
 - (NSImage*)dragImage;
 
 @end  // @interface WebDragSource(Private)
 
 
 @implementation WebDragSource
 
 - (id)initWithContentsView:(TabContentsViewCocoa*)contentsView
                   dropData:(const WebDropData*)dropData
-                pasteboard:(NSPasteboard*)pboard {
+                pasteboard:(NSPasteboard*)pboard
+         dragOperationMask:(NSDragOperation)dragOperationMask {
   if ((self = [super init])) {
     contentsView_ = contentsView;
     DCHECK(contentsView_);
 
     dropData_.reset(new WebDropData(*dropData));
     DCHECK(dropData_.get());
 
     pasteboard_.reset([pboard retain]);
     DCHECK(pasteboard_.get());
 
+    dragOperationMask_ = dragOperationMask;
+
     [self fillPasteboard];
   }
 
   return self;
 }
 
+- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
+  return dragOperationMask_;
+}
+
 - (void)lazyWriteToPasteboard:(NSPasteboard*)pboard forType:(NSString*)type {
   // Be extra paranoid; avoid crashing.
   if (!dropData_.get()) {
     NOTREACHED() << "No drag-and-drop data available for lazy write.";
     return;
   }
 
   // HTML.
   if ([type isEqualToString:NSHTMLPboardType]) {
     DCHECK(!dropData_->text_html.empty());
@@ skipping 67 matching lines @@
   [contentsView_ dragImage:[self dragImage]
                         at:position
                     offset:NSZeroSize
                      event:dragEvent
                 pasteboard:pasteboard_
                     source:contentsView_
                  slideBack:YES];
 }
 
 - (void)endDragAt:(NSPoint)screenPoint
-      isCancelled:(BOOL)cancelled {
+        operation:(NSDragOperation)operation {
   RenderViewHost* rvh = [contentsView_ tabContents]->render_view_host();
   if (rvh) {
     rvh->DragSourceSystemDragEnded();
 
     // Convert |screenPoint| to view coordinates and flip it.
     NSPoint localPoint = [contentsView_ convertPointFromBase:screenPoint];
     NSRect viewFrame = [contentsView_ frame];
     localPoint.y = viewFrame.size.height - localPoint.y;
     // Flip |screenPoint|.
     NSRect screenFrame = [[[contentsView_ window] screen] frame];
     screenPoint.y = screenFrame.size.height - screenPoint.y;
 
-    if (cancelled) {
-      rvh->DragSourceCancelledAt(localPoint.x, localPoint.y,
-                                 screenPoint.x, screenPoint.y);
-    } else {
-      rvh->DragSourceEndedAt(localPoint.x, localPoint.y,
-                             screenPoint.x, screenPoint.y);
-    }
+    rvh->DragSourceEndedAt(localPoint.x, localPoint.y,
+                           screenPoint.x, screenPoint.y,
+                           static_cast<WebKit::WebDragOperation>(operation));
   }
 
   // Make sure the pasteboard owner isn't us.
   [pasteboard_ declareTypes:[NSArray array] owner:nil];
 }
 
 - (void)moveDragTo:(NSPoint)screenPoint {
   RenderViewHost* rvh = [contentsView_ tabContents]->render_view_host();
   if (rvh) {
     // Convert |screenPoint| to view coordinates and flip it.
@@ skipping 92 matching lines @@
   if (!dropData_->plain_text.empty())
     [pasteboard_ addTypes:[NSArray arrayWithObject:NSStringPboardType]
                     owner:contentsView_];
 }
 
 - (NSImage*)dragImage {
   return MakeDragImage(dropData_.get());
 }
 
 @end  // @implementation WebDragSource (Private)