win: Implement exception snapshot

snapshot/win/cpu_context_win.h

Index: snapshot/win/cpu_context_win.h
diff --git a/snapshot/win/cpu_context_win.h b/snapshot/win/cpu_context_win.h
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index 0000000000000000000000000000000000000000..a384ccb3c9880fcae5a01527409bf2cf16d35319
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+++ b/snapshot/win/cpu_context_win.h
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+// 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.
+
+#ifndef CRASHPAD_SNAPSHOT_WIN_CPU_CONTEXT_WIN_H_
+#define CRASHPAD_SNAPSHOT_WIN_CPU_CONTEXT_WIN_H_
+
+#include <windows.h>
+
+#include "build/build_config.h"
+
+namespace crashpad {
+
+struct CPUContextX86;
+struct CPUContextX86_64;
+
+#if defined(ARCH_CPU_64_BITS) || DOXYGEN
+
+//! \brief Initializes a CPUContextX86 structure from a native context structure
+//!     on Windows.
+void InitializeX86Context(const WOW64_CONTEXT& context, CPUContextX86* out);
+
+//! \brief Initializes a CPUContextX86_64 structure from a native context
+//!     structure on Windows.
+void InitializeX64Context(const CONTEXT& context, CPUContextX86_64* out);
+
+#else  // ARCH_CPU_64_BITS
+
+//! \brief Initializes a CPUContextX86 structure from a native context structure
+//!     on Windows.
+void InitializeX86Context(const CONTEXT& context, CPUContextX86* out);
+
+#endif  // ARCH_CPU_64_BITS
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_WIN_CPU_CONTEXT_WIN_H_