Relanding "Multiprocess test client: Android child process launcher rework."

mojo/edk/embedder/platform_channel_pair.h

Index: mojo/edk/embedder/platform_channel_pair.h
diff --git a/mojo/edk/embedder/platform_channel_pair.h b/mojo/edk/embedder/platform_channel_pair.h
index f80de89cedd4dff02d37cd0c9b3bfd4206ffb4cd..9c93f760948725770bd1e410e75991691b2dba50 100644
--- a/mojo/edk/embedder/platform_channel_pair.h
+++ b/mojo/edk/embedder/platform_channel_pair.h
@@ -69,6 +69,7 @@ class MOJO_SYSTEM_IMPL_EXPORT PlatformChannelPair {
   // |PrepareToPassClientHandleToChildProcess()| and launched the child (using
   // the provided data), to create a client handle connected to the server
   // handle (in the parent process).
+  // TODO(jcivelli): remove the command_line param. http://crbug.com/670106
   static ScopedPlatformHandle PassClientHandleFromParentProcess(
       const base::CommandLine& command_line);