Add IPCs to check web copy/cut/paste for extensions with the appropriate permission bit.

chrome/browser/tab_contents/background_contents.h

Index: chrome/browser/tab_contents/background_contents.h
diff --git a/chrome/browser/tab_contents/background_contents.h b/chrome/browser/tab_contents/background_contents.h
index 11aa3e2334e538cac65e0dd473cfcfbbce847664..aa568a572d67c1ce84b31513a0cb331a757cfb15 100644
--- a/chrome/browser/tab_contents/background_contents.h
+++ b/chrome/browser/tab_contents/background_contents.h
@@ -101,6 +101,8 @@ class BackgroundContents : public RenderViewHostDelegate,
                              int selected_item,
                              const std::vector<WebMenuItem>& items,
                              bool right_aligned) {}
+  virtual bool IsWebCopyCutEnabled() { return false; }
+  virtual bool IsWebPasteEnabled() { return false; }
   virtual void StartDragging(const WebDropData& drop_data,
                              WebKit::WebDragOperationsMask allowed_operations,
                              const SkBitmap& image,