First cut of privacy work for GCF. Implements IDeleteBrowsing history and mov...

chrome_frame/bho.h

Index: chrome_frame/bho.h
===================================================================
--- chrome_frame/bho.h	(revision 42644)
+++ chrome_frame/bho.h	(working copy)
@@ -7,6 +7,7 @@
 
 #include <atlbase.h>
 #include <atlcom.h>
+#include <deletebrowsinghistory.h>
 #include <exdisp.h>
 #include <exdispid.h>
 #include <mshtml.h>
@@ -16,11 +17,14 @@
 
 #include "base/scoped_comptr_win.h"
 #include "chrome_tab.h"  // NOLINT
+#include "chrome_frame/delete_chrome_history.h"
 #include "chrome_frame/resource.h"
 #include "chrome_frame/urlmon_moniker.h"
 #include "chrome_frame/urlmon_url_request.h"
 #include "grit/chrome_frame_resources.h"
 
+class DeleteChromeHistory;
+
 class PatchHelper {
  public:
   enum State { UNKNOWN, PATCH_IBROWSER, PATCH_PROTOCOL };
@@ -55,12 +59,18 @@
       IBrowserService* browser, IShellView* shell_view, BOOL done,
       VARIANT* in_arg, VARIANT* out_arg);
 
+DECLARE_GET_CONTROLLING_UNKNOWN()
 DECLARE_REGISTRY_RESOURCEID(IDR_BHO)
 DECLARE_NOT_AGGREGATABLE(Bho)
 DECLARE_PROTECT_FINAL_CONSTRUCT()
 
 BEGIN_COM_MAP(Bho)
   COM_INTERFACE_ENTRY(IObjectWithSite)
+  // When calling DeleteChromeHistory, ensure that only one instance
+  // is created to avoid mulitple message loops.
+  COM_INTERFACE_ENTRY_CACHED_TEAR_OFF(IID_IDeleteBrowsingHistory,
+                                      DeleteChromeHistory,
+                                      delete_chrome_history_.p)
 END_COM_MAP()
 
 BEGIN_SINK_MAP(Bho)
@@ -96,6 +106,10 @@
 
   static void ProcessOptInUrls(IWebBrowser2* browser, BSTR url);
 
+  // COM_INTERFACE_ENTRY_CACHED_TEAR_OFF manages the raw pointer from CComPtr
+  // which ScopedComPtr doesn't expose.
+  CComPtr<IUnknown> delete_chrome_history_;
+
  protected:
   bool PatchProtocolHandler(const CLSID& handler_clsid);