Linux: Add Breakpad client.

chrome/browser/renderer_host/render_crash_handler_host_linux.h

Index: chrome/browser/renderer_host/render_crash_handler_host_linux.h
diff --git a/chrome/browser/renderer_host/render_crash_handler_host_linux.h b/chrome/browser/renderer_host/render_crash_handler_host_linux.h
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+++ b/chrome/browser/renderer_host/render_crash_handler_host_linux.h
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+// Copyright (c) 2009 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 CHROME_BROWSER_RENDERER_HOST_RENDER_CRASH_HANDLER_HOST_LINUX_H_
+#define CHROME_BROWSER_RENDERER_HOST_RENDER_CRASH_HANDLER_HOST_LINUX_H_
+
+#include "base/singleton.h"
+#include "base/message_loop.h"
+
+// This is a singleton object which crash dumps renderers on Linux. We perform
+// the crash dump from the browser because it allows us to be outside the
+// sandbox.
+//
+// Renderers signal that they need to be dumped by sending a datagram over a
+// UNIX domain socket. All renderers share the client end of this socket which
+// is installed in their descriptor table before exec.
+class RenderCrashHandlerHostLinux : public MessageLoopForIO::Watcher,
+                                    public MessageLoop::DestructionObserver {
+ public:
+  // Get the file descriptor which renderers should be given in order to signal
+  // crashes to the browser.
+  int GetDeathSignalSocket() const {
+    return renderer_socket_;
+  }
+
+  // MessagePumbLibevent::Watcher impl:
+  virtual void OnFileCanWriteWithoutBlocking(int fd);
+  virtual void OnFileCanReadWithoutBlocking(int fd);
+
+  // MessageLoop::DestructionObserver impl:
+  virtual void WillDestroyCurrentMessageLoop();
+
+ private:
+  friend struct DefaultSingletonTraits<RenderCrashHandlerHostLinux>;
+  RenderCrashHandlerHostLinux();
+  ~RenderCrashHandlerHostLinux();
+  void Init();
+
+  int renderer_socket_;
+  int browser_socket_;
+  MessageLoopForIO::FileDescriptorWatcher file_descriptor_watcher_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(RenderCrashHandlerHostLinux);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_CRASH_HANDLER_HOST_LINUX_H_