win: Retrieve thread context for x64

snapshot/win/thread_snapshot_win.h

 // 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,
@@ skipping 42 matching lines @@
   // ThreadSnapshot:
 
   const CPUContext* Context() const override;
   const MemorySnapshot* Stack() const override;
   uint64_t ThreadID() const override;
   int SuspendCount() const override;
   int Priority() const override;
   uint64_t ThreadSpecificDataAddress() const override;
 
  private:
+#if defined(ARCH_CPU_X86_FAMILY)
+  union {
+    CPUContextX86 x86;
+    CPUContextX86_64 x86_64;
+  } context_union_;
+#endif
   CPUContext context_;
   MemorySnapshotWin stack_;
   ProcessReaderWin::Thread thread_;
   InitializationStateDcheck initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadSnapshotWin);
 };
 
 }  // namespace internal
 }  // namespace crashpad
 
 #endif  // CRASHPAD_SNAPSHOT_WIN_THREAD_SNAPSHOT_WIN_H_