Always set symbol visibility when compiling with GCC / Clang.

ppapi/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 
 assert(!is_android || enable_plugins,
        "//ppapi should not be referenced when is_android && !enable_plugins")
 
 if (is_mac) {
@@ skipping 229 matching lines @@
     "//build/win:default_exe_manifest",
   ]
 }
 
 if (is_nacl_glibc) {
   shared_library("ppapi_cpp_lib") {
     # When using gcc, we hide all symbols by default, but that breaks at
     # link time as the test executable requires symbols defined in the
     # shared library.
     configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
+    configs += [ "//build/config/gcc:symbol_visibility_default" ]
 
     sources = ppapi_sources.cpp_source_files
     sources += [
       "cpp/module_embedder.h",
       "cpp/ppp_entrypoints.cc",
     ]
     cflags = [ "-fPIC" ]
     deps = [
       "//build/config/nacl:nacl_base",
     ]
@@ skipping 183 matching lines @@
   group("ppapi_nacl_tests_all") {
     data_deps = [
       ":copy_test_files",
       ":ppapi_nacl_tests_copy(//build/toolchain/nacl:clang_newlib_${target_cpu})",
       ":ppapi_nacl_tests(//build/toolchain/nacl:glibc_${target_cpu})",
       ":ppapi_nacl_tests(//build/toolchain/nacl:newlib_pnacl)",
       ":ppapi_nacl_tests(//build/toolchain/nacl:newlib_pnacl_nonsfi)",
     ]
   }
 }