Import 'futures-channel' rust crate version 0.3.4

Bug: b/151760391
Test: m crosvm.experimental
Change-Id: I40daaec86f1c422d2bc563057f04384d4fda7740
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..55f292d
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,31 @@
+[package]
+name = "futures-channel"
+edition = "2018"
+version = "0.3.4"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/futures-rs"
+homepage = "https://rust-lang.github.io/futures-rs"
+documentation = "https://docs.rs/futures-channel/0.3.0"
+description = """
+Channels for asynchronous communication using futures-rs.
+"""
+
+[features]
+default = ["std"]
+std = ["alloc", "futures-core/std"]
+alloc = ["futures-core/alloc"]
+sink = ["futures-sink"]
+
+# Unstable features
+# These features are outside of the normal semver guarantees and require the
+# `unstable` feature as an explicit opt-in to unstable API.
+unstable = ["futures-core/unstable"]
+cfg-target-has-atomic = ["futures-core/cfg-target-has-atomic"]
+
+[dependencies]
+futures-core = { path = "../futures-core", version = "0.3.4", default-features = false }
+futures-sink = { path = "../futures-sink", version = "0.3.4", default-features = false, optional = true }
+
+[package.metadata.docs.rs]
+all-features = true