Add MinidumpExceptionWriter::InitializeFromSnapshot() and test

snapshot/test/test_exception_snapshot.h

Index: snapshot/test/test_exception_snapshot.h
diff --git a/snapshot/test/test_exception_snapshot.h b/snapshot/test/test_exception_snapshot.h
new file mode 100644
index 0000000000000000000000000000000000000000..729f5f660a132e829bd29983fe77869fc621051c
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+++ b/snapshot/test/test_exception_snapshot.h
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+// Copyright 2014 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_TEST_TEST_EXCEPTION_SNAPSHOT_H_
+#define CRASHPAD_SNAPSHOT_TEST_TEST_EXCEPTION_SNAPSHOT_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "snapshot/cpu_context.h"
+#include "snapshot/exception_snapshot.h"
+
+namespace crashpad {
+namespace test {
+
+//! \brief A test ExceptionSnapshot that can carry arbitrary data for testing
+//!     purposes.
+class TestExceptionSnapshot final : public ExceptionSnapshot {
+ public:
+  TestExceptionSnapshot();
+  ~TestExceptionSnapshot();
+
+  //! \brief Obtains a pointer to the underlying mutable CPUContext structure.
+  //!
+  //! This method is intended to be used by callers to populate the CPUContext
+  //! structure.
+  //!
+  //! \return The same pointer that Context() does, while treating the data as
+  //!     mutable.
+  //!
+  //! \attention This returns a non-`const` pointer to this object’s private
+  //!     data so that a caller can populate the context structure directly.
+  //!     This is done because providing setter interfaces to each field in the
+  //!     context structure would be unwieldy and cumbersome. Care must be taken
+  //!     to populate the context structure correctly.
+  CPUContext* MutableContext() { return &context_; }
+
+  void SetThreadID(uint64_t thread_id) { thread_id_ = thread_id; }
+  void SetException(uint32_t exception) { exception_ = exception; }
+  void SetExceptionInfo(uint32_t exception_info) {
+    exception_info_ = exception_info;
+  }
+  void SetExceptionAddress(uint64_t exception_address) {
+    exception_address_ = exception_address;
+  }
+  void SetCodes(const std::vector<uint64_t>& codes) { codes_ = codes; }
+
+  // ExceptionSnapshot:
+
+  const CPUContext* Context() const override;
+  uint64_t ThreadID() const override;
+  uint32_t Exception() const override;
+  uint32_t ExceptionInfo() const override;
+  uint64_t ExceptionAddress() const override;
+  const std::vector<uint64_t>& Codes() const override;
+
+ private:
+  union {
+    CPUContextX86 x86;
+    CPUContextX86_64 x86_64;
+  } context_union_;
+  CPUContext context_;
+  uint64_t thread_id_;
+  uint32_t exception_;
+  uint32_t exception_info_;
+  uint64_t exception_address_;
+  std::vector<uint64_t> codes_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestExceptionSnapshot);
+};
+
+}  // namespace test
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_TEST_TEST_EXCEPTION_SNAPSHOT_H_