Add crashpad_info, MachOImageAnnotationsReader, and its test

client/crashpad_info.h

Index: client/crashpad_info.h
diff --git a/client/crashpad_info.h b/client/crashpad_info.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_CLIENT_CRASHPAD_INFO_H_
+#define CRASHPAD_CLIENT_CRASHPAD_INFO_H_
+
+#include "base/basictypes.h"
+
+#include <stdint.h>
+
+#include "client/simple_string_dictionary.h"
+
+namespace crashpad {
+
+//! \brief A structure that can be used by a Crashpad-enabled program to
+//!     provide information to the Crashpad crash handler.
+//!
+//! It is possible for one CrashpadInfo structure to appear in each loaded code
+//! module in a process, but from the perspective of the user of the client
+//! interface, there is only one global CrashpadInfo structure, located in the
+//! module that contains the client interface code.
+struct CrashpadInfo {
+ public:
+  //! \brief Returns the global CrashpadInfo structure.
+  static CrashpadInfo* GetCrashpadInfo();
+
+  CrashpadInfo();
+
+  void set_simple_annotations(SimpleStringDictionary* simple_annotations) {
+    simple_annotations_ = simple_annotations;
+  }
+
+  static const uint32_t kSignature = 'CPad';
+
+ private:
+  // The compiler won’t necessarily see anyone using these fields, but it
+  // shouldn’t warn about that. These fields aren’t intended for use by the
+  // process they’re found in, they’re supposed to be read by the crash
+  // reporting process.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-private-field"
+  // Fields present in version 1:
+  uint32_t signature_;  // kSignature
+  uint32_t size_;  // The size of the entire CrashpadInfo structure.
+  uint32_t version_;  // kVersion
+  uint32_t padding_0_;
+  SimpleStringDictionary* simple_annotations_;  // weak
+#pragma clang diagnostic pop
+
+  DISALLOW_COPY_AND_ASSIGN(CrashpadInfo);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_CLIENT_CRASHPAD_INFO_H_