XFA: Hide xfa targets in gyp (similar to GN)

pdfium.gyp

 # Copyright 2015 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     # TODO(thakis): Enable this, pdfium:29
     #'chromium_code': 1,
     'pdf_use_skia%': 0,
     'pdf_enable_v8%': 1,
@@ skipping 633 matching lines @@
         'fpdfsdk/src/pdfwindow/PWL_ListCtrl.cpp',
         'fpdfsdk/src/pdfwindow/PWL_Note.cpp',
         'fpdfsdk/src/pdfwindow/PWL_ScrollBar.cpp',
         'fpdfsdk/src/pdfwindow/PWL_Signature.cpp',
         'fpdfsdk/src/pdfwindow/PWL_SpecialButton.cpp',
         'fpdfsdk/src/pdfwindow/PWL_Utils.cpp',
         'fpdfsdk/src/pdfwindow/PWL_Wnd.cpp',
       ],
     },
     {
-      'target_name': 'fpdfxfa',
-      'type': 'static_library',
-      'dependencies': [
-        'javascript',
-        'xfa.gyp:xfa',
-      ],
-      'sources': [
-        'fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp',
-        'fpdfsdk/src/fpdfxfa/fpdfxfa_doc.cpp',
-        'fpdfsdk/src/fpdfxfa/fpdfxfa_page.cpp',
-        'fpdfsdk/src/fpdfxfa/fpdfxfa_util.cpp',
-        'fpdfsdk/include/fpdfxfa/fpdfxfa_app.h',
-        'fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h',
-        'fpdfsdk/include/fpdfxfa/fpdfxfa_page.h',
-        'fpdfsdk/include/fpdfxfa/fpdfxfa_util.h',
-      ],
-    },
-    {
       'target_name': 'javascript',
       'type': 'static_library',
       'sources': [
         'fpdfsdk/include/javascript/IJavaScript.h',
         'fpdfsdk/src/javascript/JS_Runtime_Stub.cpp',
       ],
       'conditions': [
         ['pdf_enable_v8==1', {
           'include_dirs': [
             '<(DEPTH)/v8',
@@ skipping 186 matching lines @@
             '<(DEPTH)/v8/include',
           ],
           'dependencies': [
             '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
             '<(DEPTH)/v8/tools/gyp/v8.gyp:v8_libplatform',
           ],
         }],
       ],
     },
   ],
+  'conditions': [
+    ['pdf_enable_xfa==1', {
+      'targets': [
+        {
+          'target_name': 'fpdfxfa',
+          'type': 'static_library',
+          'dependencies': [
+            'javascript',
+            'xfa.gyp:xfa',
+          ],
+          'sources': [
+            'fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp',
+            'fpdfsdk/src/fpdfxfa/fpdfxfa_doc.cpp',
+            'fpdfsdk/src/fpdfxfa/fpdfxfa_page.cpp',
+            'fpdfsdk/src/fpdfxfa/fpdfxfa_util.cpp',
+            'fpdfsdk/include/fpdfxfa/fpdfxfa_app.h',
+            'fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h',
+            'fpdfsdk/include/fpdfxfa/fpdfxfa_page.h',
+            'fpdfsdk/include/fpdfxfa/fpdfxfa_util.h',
+          ],
+        },
+      ]
+    }],
+  ]
 }