Fixed drag and drop into and out of Browser Plugin.

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index c38df686ace6fd3d7fdfb954ebdc491af4776fc2..e5d713127e73e9deb1bae1d9ee8150699a3e9f7d 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -17,6 +17,7 @@
 #include "content/public/browser/web_ui.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
@@ -343,8 +344,18 @@ class WebContents : public PageNavigator,
   // times, subsequent calls are ignored.
   virtual void OnCloseStarted() = 0;
 
-  // A render view-originated drag has ended. Informs the render view host and
-  // WebContentsDelegate.
+  // Informs the render view host and the BrowserPluginEmbedder, if present, of
+  // a Drag Source End.
+  virtual void DragSourceEndedAt(int client_x, int client_y, int screen_x,

[Fady Samuel, 2013/04/18 18:22:56]

Is this necessary?

[mthiesse, 2013/04/18 18:36:32]

Done.

+      int screen_y, WebKit::WebDragOperation operation) = 0;
+
+  // Informs the render view host and the BrowserPluginEmbedder, if present, of
+  // a Drag Source Move.
+  virtual void DragSourceMovedTo(int client_x, int client_y,

[Fady Samuel, 2013/04/18 18:22:56]

Is this necessary?

[mthiesse, 2013/04/18 18:36:32]

Done.

+                                 int screen_x, int screen_y) = 0;
+
+  // A render view-originated drag has ended. Informs the render view host, the
+  // WebContentsDelegate, and the BrowserPluginEmbedder, if present.

[Fady Samuel, 2013/04/18 18:22:56]

Please avoid referencing BrowserPluginEmbedder here as it's an implementation
detail. The notion of an EmbedderWebContents exists though, I think.

[mthiesse, 2013/04/18 18:36:32]

It's probably fine if I leave this comment as-is. Right?

   virtual void SystemDragEnded() = 0;
 
   // Notification the user has made a gesture while focus was on the