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..129df77abc22d7f169c485b6d4718cbab8a9700f 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 +38,15 @@ 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) {}

[sanjeevr, 2012/01/19 15:36:33]

A channel handle that is created with only a handle cannot be sent over an IPC
channel (like the Posix one can be). This needs to be mentioned. Or we can use
bInherit as TRUE in the DuplicateHandle call below. This way just marshalling
the handle value over will work. But for that you need to change
ParamTraits<ChannelHandle>

+  ChannelHandle(const ChannelHandle& other) : name(other.name), pipe(NULL) {
+    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 +56,9 @@ struct ChannelHandle {
 #if defined(OS_POSIX)
   base::FileDescriptor socket;
 #endif  // defined(OS_POSIX)
+#if defined(OS_WIN)
+  base::win::ScopedHandle pipe;
+#endif
 
 };