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}
  AccessType GetExtensionAccess(const Extension* extension,
                                const GURL& url,
                                 int tab_id) {
     bool allowed_script = IsAllowedScript(extension, url, tab_id);
     bool allowed_capture = extension->permissions_data()->CanCaptureVisiblePage(
        url, tab_id, nullptr,
        extensions::CaptureRequirement::kActiveTabOrAllUrls);
 
     if (allowed_script && allowed_capture)
       return ALLOWED_SCRIPT_AND_CAPTURE;
    if (allowed_script)
      return ALLOWED_SCRIPT_ONLY;
    if (allowed_capture)
      return ALLOWED_CAPTURE_ONLY;
    return DISALLOWED;
  }

  AccessType GetExtensionAccess(const Extension* extension,
                                const GURL& url,
                                 int tab_id) {
     bool allowed_script = IsAllowedScript(extension, url, tab_id);
     bool allowed_capture = extension->permissions_data()->CanCaptureVisiblePage(
        url, tab_id, nullptr);
 
     if (allowed_script && allowed_capture)
       return ALLOWED_SCRIPT_AND_CAPTURE;
    if (allowed_script)
      return ALLOWED_SCRIPT_ONLY;
    if (allowed_capture)
      return ALLOWED_CAPTURE_ONLY;
    return DISALLOWED;
  }
