Create NaCl build of gtest.

testing/gtest.gyp

Index: testing/gtest.gyp
diff --git a/testing/gtest.gyp b/testing/gtest.gyp
index f4577df8d23b5025d1ece31405f79a3ac9307b4e..671a508675d49c669ce75bc945ac8989e1cf4504 100644
--- a/testing/gtest.gyp
+++ b/testing/gtest.gyp
@@ -3,46 +3,16 @@
 # found in the LICENSE file.
 
 {
+  'includes': [
+    'gtest.gypi',
+  ],
   'targets': [
     {
       'target_name': 'gtest',
       'toolsets': ['host', 'target'],
       'type': 'static_library',
       'sources': [
-        'gtest/include/gtest/gtest-death-test.h',
-        'gtest/include/gtest/gtest-message.h',
-        'gtest/include/gtest/gtest-param-test.h',
-        'gtest/include/gtest/gtest-printers.h',
-        'gtest/include/gtest/gtest-spi.h',
-        'gtest/include/gtest/gtest-test-part.h',
-        'gtest/include/gtest/gtest-typed-test.h',
-        'gtest/include/gtest/gtest.h',
-        'gtest/include/gtest/gtest_pred_impl.h',
-        'gtest/include/gtest/internal/gtest-death-test-internal.h',
-        'gtest/include/gtest/internal/gtest-filepath.h',
-        'gtest/include/gtest/internal/gtest-internal.h',
-        'gtest/include/gtest/internal/gtest-linked_ptr.h',
-        'gtest/include/gtest/internal/gtest-param-util-generated.h',
-        'gtest/include/gtest/internal/gtest-param-util.h',
-        'gtest/include/gtest/internal/gtest-port.h',
-        'gtest/include/gtest/internal/gtest-string.h',
-        'gtest/include/gtest/internal/gtest-tuple.h',
-        'gtest/include/gtest/internal/gtest-type-util.h',
-        'gtest/src/gtest-all.cc',
-        'gtest/src/gtest-death-test.cc',
-        'gtest/src/gtest-filepath.cc',
-        'gtest/src/gtest-internal-inl.h',
-        'gtest/src/gtest-port.cc',
-        'gtest/src/gtest-printers.cc',
-        'gtest/src/gtest-test-part.cc',
-        'gtest/src/gtest-typed-test.cc',
-        'gtest/src/gtest.cc',
-        'multiprocess_func_list.cc',
-        'multiprocess_func_list.h',
-        'platform_test.h',
-      ],
-      'sources!': [
-        'gtest/src/gtest-all.cc',  # Not needed by our build.
+        '<@(gtest_sources)',
       ],
       'include_dirs': [
         'gtest',