Merge to XFA: Consolidate test support code.

samples/samples.gyp

 # Copyright 2014 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': {
     'pdf_enable_v8%': 1,
   },
   'target_defaults': {
     'type': 'executable',
@@ skipping 17 matching lines @@
           '<(DEPTH)/v8',
           '<(DEPTH)/v8/include',
         ],
       }],
     ],
   },
   'targets': [
     {
       'target_name': 'pdfium_test',
       'type': 'executable',
+      'dependencies': [
+        '../pdfium.gyp:pdfium',
+        '../pdfium.gyp:test_support',
+      ],
       'sources': [
         'pdfium_test.cc',
         'image_diff_png.cc',
       ],
       'conditions': [
         ['pdf_enable_v8==1', {
           'dependencies': [
             '<(DEPTH)/v8/tools/gyp/v8.gyp:v8_libplatform',
           ],
         }],
@@ skipping 11 matching lines @@
         '../../',
       ],
       'sources': [
         'image_diff.cc',
         'image_diff_png.h',
         'image_diff_png.cc',
       ],
     },
   ],
 }