Make skgputest target depend on gl/glx/glu or egl/gles2 libs on linux

gyp/gputest.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'targets': [
     {
       'target_name': 'skgputest',
       'product_name': 'skia_skgputest',
       'type': 'static_library',
@@ skipping 39 matching lines @@
           ],
         }],
         [ 'skia_angle', {
           'dependencies': [
             'angle.gyp:*',
           ],
           'export_dependent_settings': [
             'angle.gyp:*',
           ],
         }],
+        [ '(skia_os == "linux" or skia_os == "chromeos") and skia_egl == 1', {
+          'link_settings': {
+            'libraries': [
+              '-lEGL',
+              '-lGLESv2',
+            ],
+          },
+        }],
+        [ '(skia_os == "linux" or skia_os == "chromeos") and skia_egl == 0', {
+          'link_settings': {
+            'libraries': [
+              '-lGL',
+              '-lGLU',
+              '-lX11',
+            ],
+          },
+        }],
         [ 'skia_os == "android"', {
           'defines': [
             'GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE=1',
           ],
           'link_settings': {
             'libraries': [
               '-lGLESv2',
               '-lEGL',
             ],
           },
@@ skipping 26 matching lines @@
             ['exclude', '_angle\.(h|cpp)$'],
           ],
         }],
         [ 'skia_command_buffer == 0', {
           'sources/': [ ['exclude', '_command_buffer\.(h|cpp)$'], ],
         }],
       ],
     },
   ],
 }