Have the Debugger extension api check that it has access to the tab

Check PermissionsData::CanAccessTab() prior to attaching the debugger.

BUG=367567

Review URL: https://codereview.chromium.org/352523003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280354 0039d316-1c4b-4281-b951-d872f2087c98
  bool Blocked(const Extension* extension, const GURL& url, int tab_id) {
    return !(extension->permissions_data()->CanAccessPage(
                 extension, url, url, tab_id, -1, NULL) ||
             extension->permissions_data()->CanCaptureVisiblePage(tab_id,
                                                                  NULL));
  }

  bool Blocked(const Extension* extension, const GURL& url, int tab_id) {
    return !(extension->permissions_data()->CanAccessPage(
                 extension, url, url, tab_id, -1, NULL) ||
             extension->permissions_data()->CanCaptureVisiblePage(tab_id,
                                                                  NULL));
  }
