Plumb file system permission into WebviewGuest.

chrome/browser/guest_view/web_view/web_view_guest.cc

Index: chrome/browser/guest_view/web_view/web_view_guest.cc
diff --git a/chrome/browser/guest_view/web_view/web_view_guest.cc b/chrome/browser/guest_view/web_view/web_view_guest.cc
index 9f9ea466b834bb7667ae8d76cd3b6dcf6b5638ab..632781a294ebf45ba54898dc74b972ce327e15ec 100644
--- a/chrome/browser/guest_view/web_view/web_view_guest.cc
+++ b/chrome/browser/guest_view/web_view/web_view_guest.cc
@@ -134,6 +134,8 @@ static std::string PermissionTypeToString(WebViewPermissionType type) {
       return webview::kPermissionTypeNewWindow;
     case WEB_VIEW_PERMISSION_TYPE_POINTER_LOCK:
       return webview::kPermissionTypePointerLock;
+    case WEB_VIEW_PERMISSION_TYPE_FILESYSTEM:
+      return webview::kPermissionTypeFileSystem;
     default:
       NOTREACHED();
       return std::string();
@@ -257,6 +259,9 @@ void WebViewGuest::RecordUserInitiatedUMA(const PermissionResponseInfo& info,
         content::RecordAction(
             UserMetricsAction("WebView.PermissionAllow.PointerLock"));
         break;
+      case WEB_VIEW_PERMISSION_TYPE_FILESYSTEM:
+        content::RecordAction(
+            UserMetricsAction("WebView.PermissionAllow.FileSystem"));
       default:
         break;
     }
@@ -289,6 +294,10 @@ void WebViewGuest::RecordUserInitiatedUMA(const PermissionResponseInfo& info,
         content::RecordAction(
             UserMetricsAction("WebView.PermissionDeny.PointerLock"));
         break;
+      case WEB_VIEW_PERMISSION_TYPE_FILESYSTEM:
+        content::RecordAction(
+            UserMetricsAction("WebView.PermissionDeny.FileSystem"));
+        break;
       default:
         break;
     }
@@ -616,6 +625,27 @@ void WebViewGuest::Reload() {
   guest_web_contents()->GetController().Reload(false);
 }
 
+void WebViewGuest::RequestFileSystemPermission(
+    const GURL& url,
+    const base::Callback<void(bool)>& callback) {
+  base::DictionaryValue request_info;
+  request_info.Set(guestview::kUrl, base::Value::CreateStringValue(url.spec()));
+  RequestPermission(
+      WEB_VIEW_PERMISSION_TYPE_FILESYSTEM,
+      request_info,
+      base::Bind(&WebViewGuest::OnWebViewFileSystemPermissionResponse,
+                 base::Unretained(this),
+                 callback),
+      false /* allowed_by_default */);
+}
+
+void WebViewGuest::OnWebViewFileSystemPermissionResponse(
+    const base::Callback<void(bool)>& callback,
+    bool allow,
+    const std::string& user_input) {
+  callback.Run(!allow || !attached());
+}
+
 void WebViewGuest::RequestGeolocationPermission(
     int bridge_id,
     const GURL& requesting_frame,