Add a first-class off-store install UI to chrome://extensions/.

content/public/browser/web_contents_view.h

Index: content/public/browser/web_contents_view.h
diff --git a/content/public/browser/web_contents_view.h b/content/public/browser/web_contents_view.h
index 73abdc53479f1179d5d2e80e454f0301400a491e..f8a7bbb4772e2662ce6f3654b2270957684eb3a8 100644
--- a/content/public/browser/web_contents_view.h
+++ b/content/public/browser/web_contents_view.h
@@ -15,6 +15,8 @@
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
+class WebDropData;
+
 namespace content {
 
 class RenderViewHost;
@@ -107,6 +109,9 @@ class CONTENT_EXPORT WebContentsView
   virtual bool IsDoingDrag() const = 0;
   virtual void CancelDragAndCloseTab() = 0;
 
+  // Returns the current drop data, if any.
+  virtual WebDropData* GetDropData() const = 0;
+
   // If we close the tab while a UI control is in an event-tracking
   // loop, the control may message freed objects and crash.
   // WebContents::Close() calls IsEventTracking(), and if it returns