Fixed drag and drop into and out of Browser Plugin.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index e50916b40f019994f70a4f5e7ad2ba384de8f25e..eec180ef7c6d6b1ce692d3fe1709ed20a54a10d3 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -256,6 +256,10 @@ const char kDisableBrowserPluginCompositing[] =
 const char kEnableBrowserPluginForAllViewTypes[] =
     "enable-browser-plugin-for-all-view-types";
 
+// Enables Drag and Drop into and out of Browser Plugin.
+// kEnableBrowserPluginGuestViews must also be set at this time.
+const char kEnableBrowserPluginDragDrop[]   = "enable-browser-plugin-drag-drop";
+
 // Enable/Disable the creation of compositing layers for fixed position
 // elements. Three options are needed to support four possible scenarios:
 //  1. Default (disabled)