Code:   void GrantActiveTab(const GURL& url) {
     APIPermissionSet tab_api_permissions;
     tab_api_permissions.insert(APIPermission::kTab);
     URLPatternSet tab_hosts;
    tab_hosts.AddOrigin(UserScript::ValidUserScriptSchemes(),
                        url::Origin::Create(url).GetURL());
     PermissionSet tab_permissions(std::move(tab_api_permissions),
                                   ManifestPermissionSet(), tab_hosts,
                                   tab_hosts);
    active_tab_->permissions_data()->UpdateTabSpecificPermissions(
        kTabId, tab_permissions);
   }

Commit Message: Call CanCaptureVisiblePage in page capture API.

Currently the pageCapture permission allows access
to arbitrary local files and chrome:// pages which
can be a security concern. In order to address this,
the page capture API needs to be changed similar to
the captureVisibleTab API. The API will now only allow
extensions to capture otherwise-restricted URLs if the
user has granted activeTab. In addition, file:// URLs are
only capturable with the "Allow on file URLs" option enabled.

Bug: 893087

Change-Id: I6d6225a3efb70fc033e2e1c031c633869afac624
Reviewed-on: https://chromium-review.googlesource.com/c/1330689
Commit-Queue: Bettina Dea <bdea@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615248}
CWE ID: CWE-20
  void GrantActiveTab(const GURL& url) {
  void GrantActiveTab(const Extension& extension, const GURL& url) {
     APIPermissionSet tab_api_permissions;
     tab_api_permissions.insert(APIPermission::kTab);
     URLPatternSet tab_hosts;
    tab_hosts.AddOrigin(UserScript::ValidUserScriptSchemes(),
                        url::Origin::Create(url).GetURL());
     PermissionSet tab_permissions(std::move(tab_api_permissions),
                                   ManifestPermissionSet(), tab_hosts,
                                   tab_hosts);
    extension.permissions_data()->UpdateTabSpecificPermissions(kTabId,
                                                               tab_permissions);
   }
