Android: Add chrome-specific dynamic linker.

third_party/crazy_linker/crazy_linker/src/crazy_linker_thread.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRAZY_LINKER_THREAD_H
+#define CRAZY_LINKER_THREAD_H
+
+#include <stdarg.h>
+#include <stddef.h>
+
+namespace crazy {
+
+// Per-thread context used during crazy linker operations.
+class ThreadData {
+
+public:
+  ThreadData() {}
+
+  // Init new ThreadData instance.
+  void Init();
+
+  // Return the current error message. This also clears the internal
+  // error message, which means that the next call to this method
+  // will return a pointer to an empty string unless AppendError()
+  // was called.
+  const char* GetError() const {
+    return dlerror_;
+  }
+
+  // Swap the error buffers.
+  void SwapErrorBuffers();
+
+  // Set message string in current dlerror buffer.
+  void SetError(const char* fmt, ...) {
+    va_list args;
+    va_start(args, fmt);
+    SetErrorArgs(fmt, args);
+    va_end(args);
+  }
+
+  void SetErrorArgs(const char* fmt, va_list args);
+
+  // Append message string to current dlerror buffer.
+  void AppendError(const char* fmt, ...) {
+    va_list args;
+    va_start(args, fmt);
+    AppendErrorArgs(fmt, args);
+    va_end(args);
+  }
+
+  void AppendErrorArgs(const char* fmt, va_list args);
+
+private:
+  // Pointer to the current dlerror buffer. This points to one
+  // of the dlerror_buffers[] arrays, swapped on each dlerror()
+  // call.
+  char* dlerror_;
+
+  // Size of each dlerror message buffer size.
+  static const size_t kBufferSize = 512;
+
+  // Two buffers used to store dlerror messages.
+  char dlerror_buffers_[2][kBufferSize];
+};
+
+// Retrieves the ThreadData structure for the current thread.
+// The first time this is called on a given thread, this creates
+// a fresh new object, so this should never return NULL.
+ThreadData* GetThreadData();
+
+// Faster variant that should only be called when GetThreadData() was
+// called at least once on the current thread.
+ThreadData* GetThreadDataFast();
+
+// Set the linker error string for the current thread.
+void SetLinkerErrorString(const char* str);
+
+// Set the formatted linker error for the current thread.
+void SetLinkerError(const char* fmt, ...);
+
+}  // namespace crazy;
+
+#endif  // CRAZY_LINKER_THREAD_H