win: make CrashpadInfo retrievable

snapshot/crashpad_info_client_options_test_module.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "build/build_config.h"
 #include "client/crashpad_info.h"
 
+#if defined(OS_POSIX)
 #define EXPORT __attribute__((visibility("default")))
+#elif defined(OS_WIN)
+#include <windows.h>
+#define EXPORT __declspec(dllexport)
+#endif  // OS_POSIX
 
 extern "C" {
 
 // Returns the module’s CrashpadInfo structure. Assuming that this file is built
 // into a loadable_module with a distinct static copy of the Crashpad client
 // library from the copy built into the loader of this loadable_module, this
 // will return a different CrashpadInfo structure than the one that the loader
 // uses. Having an extra CrashpadInfo structure makes it possible to test
 // behaviors that are relevant in the presence of multiple Crashpad
 // client-enabled modules.
 //
 // This function is used by the CrashpadInfoClientOptions.TwoModules test in
 // crashpad_info_client_options_test.cc.
 EXPORT crashpad::CrashpadInfo* TestModule_GetCrashpadInfo() {
   return crashpad::CrashpadInfo::GetCrashpadInfo();
 }
 
 }  // extern "C"
+
+#if defined(OS_WIN)
+BOOL WINAPI DllMain(HINSTANCE hinstance, DWORD reason, LPVOID reserved) {
+  return TRUE;
+}
+#endif  // OS_WIN