The UI part of search-by-image search.

chrome/browser/tab_contents/render_view_context_menu.h

Index: chrome/browser/tab_contents/render_view_context_menu.h
===================================================================
--- chrome/browser/tab_contents/render_view_context_menu.h	(revision 214769)
+++ chrome/browser/tab_contents/render_view_context_menu.h	(working copy)
@@ -237,6 +237,9 @@
   // Copy to the clipboard an image located at a point in the RenderView
   void CopyImageAt(int x, int y);
 
+  // Get an image located at a point in the RenderView for search.
+  void GetImageThumbnailForSearch(int x, int y);
+
   // Launch the inspector targeting a point in the RenderView
   void Inspect(int x, int y);