Drag-and-drop: Target drag messages to specific RenderWidgets.

content/browser/web_contents/web_contents_view_mac.mm

 // 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 <Carbon/Carbon.h>
 
 #import "content/browser/web_contents/web_contents_view_mac.h"
 
 #include <string>
 
@@ skipping 156 matching lines @@
   bounds.origin.y = [screen frame].size.height - bounds.origin.y
       - bounds.size.height;
   *out = gfx::Rect(NSRectToCGRect(bounds));
 }
 
 void WebContentsViewMac::StartDragging(
     const DropData& drop_data,
     WebDragOperationsMask allowed_operations,
     const gfx::ImageSkia& image,
     const gfx::Vector2d& image_offset,
-    const DragEventSourceInfo& event_info) {
+    const DragEventSourceInfo& event_info,
+    RenderWidgetHostImpl* source_rwh) {
   // By allowing nested tasks, the code below also allows Close(),
   // which would deallocate |this|.  The same problem can occur while
   // processing -sendEvent:, so Close() is deferred in that case.
   // Drags from web content do not come via -sendEvent:, this sets the
   // same flag -sendEvent: would.
   base::mac::ScopedSendingEvent sending_event_scoper;
 
   // The drag invokes a nested event loop, arrange to continue
   // processing events.
   base::MessageLoop::ScopedNestableTaskAllower allow(
@@ skipping 530 matching lines @@
 
 - (void)viewDidHide {
   [self updateWebContentsVisibility];
 }
 
 - (void)viewDidUnhide {
   [self updateWebContentsVisibility];
 }
 
 @end