Initialize IPC:ChannelHandle from existing HANDLE

ipc/ipc_channel_handle.h

Index: ipc/ipc_channel_handle.h
diff --git a/ipc/ipc_channel_handle.h b/ipc/ipc_channel_handle.h
index ba034cca23b87b51557d6f3e53ab992ee0716e79..349dec2229505048ce5085c203269dd1c3a3091b 100644
--- a/ipc/ipc_channel_handle.h
+++ b/ipc/ipc_channel_handle.h
@@ -10,6 +10,9 @@
 
 #include "build/build_config.h"
 
+#if defined(OS_WIN)
+#include "base/win/scoped_handle.h"
+#endif
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #endif
@@ -35,6 +38,23 @@ struct ChannelHandle {
   // processes with different working directories.
   ChannelHandle(const std::string& n) : name(n) {}
   ChannelHandle(const char* n) : name(n) {}
+#if defined(OS_WIN)
+  ChannelHandle(HANDLE h) : pipe(h) {}
+  ChannelHandle(const ChannelHandle& other) {
+    Assign(other);
+  }
+  ChannelHandle& operator=(const ChannelHandle& other) {
+    Assign(other);
+    return *this;
+  }
+  void Assign(const ChannelHandle& other) {
+    name = other.name;
+    HANDLE copy = NULL;
+    DuplicateHandle(GetCurrentProcess(), other.pipe, GetCurrentProcess(),
+                    &copy, 0, FALSE, DUPLICATE_SAME_ACCESS);
+    pipe.Set(copy);
+  }
+#endif
 #if defined(OS_POSIX)
   ChannelHandle(const std::string& n, const base::FileDescriptor& s)
       : name(n), socket(s) {}
@@ -44,6 +64,9 @@ struct ChannelHandle {
 #if defined(OS_POSIX)
   base::FileDescriptor socket;
 #endif  // defined(OS_POSIX)
+#if defined(OS_WIN)
+  base::win::ScopedHandle pipe;

[cpu_(ooo_6.6-7.5), 2012/01/19 20:56:05]

so base::FileDescriptor does not close the descriptor on destruction, in other
words is not a scoped handle, so I am thinking that here you should just have
the raw handle so the behavior is the same.

This will also eliminate the duplicatehandle part.

+#endif
 
 };