protobuf protobuf-python: Upgrade to 3.7.0

CQ-DEPEND=CL:1528691,CL:1531183,CL:1531185,CL:1531336
BUG=chromium:937442
TEST=PreCQ passes, build_packages and build_image work

Change-Id: Ibc7aa899f2ac2ecb892150bff8cb9d864a7e0e73
Reviewed-on: https://chromium-review.googlesource.com/1526361
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Allen Webb <allenwebb@google.com>
diff --git a/dev-python/protobuf-python/protobuf-python-3.7.0.ebuild b/dev-python/protobuf-python/protobuf-python-3.7.0.ebuild
new file mode 100644
index 0000000..4b5ffd9
--- /dev/null
+++ b/dev-python/protobuf-python/protobuf-python-3.7.0.ebuild
@@ -0,0 +1,50 @@
+# Copyright 2008-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="6"
+PYTHON_COMPAT=(python{2_7,3_4,3_5,3_6,3_7})
+
+inherit distutils-r1
+
+DESCRIPTION="Google's Protocol Buffers - Python bindings"
+HOMEPAGE="https://developers.google.com/protocol-buffers/ https://github.com/protocolbuffers/protobuf"
+SRC_URI="https://github.com/protocolbuffers/protobuf/archive/v${PV}.tar.gz -> protobuf-${PV}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0/18"
+KEYWORDS="*"
+IUSE=""
+
+DEPEND="${PYTHON_DEPS}
+	~dev-libs/protobuf-${PV}
+	dev-python/namespace-google[${PYTHON_USEDEP}]
+	dev-python/setuptools[${PYTHON_USEDEP}]
+	dev-python/six[${PYTHON_USEDEP}]"
+RDEPEND="${DEPEND}
+	!<dev-libs/protobuf-3[python(-)]"
+
+S="${WORKDIR}/protobuf-${PV}/python"
+
+python_prepare_all() {
+	eapply -p2 "${FILESDIR}/${PN}-3.7.0-google.protobuf.pyext._message.MessageMeta.patch"
+	distutils-r1_python_prepare_all
+}
+
+python_configure_all() {
+	mydistutilsargs=(--cpp_implementation)
+}
+
+python_compile() {
+	python_is_python3 || local -x CXXFLAGS="${CXXFLAGS} -fno-strict-aliasing"
+	distutils-r1_python_compile
+}
+
+python_test() {
+	esetup.py test
+}
+
+python_install_all() {
+	distutils-r1_python_install_all
+
+	find "${D}" -name "*.pth" -delete || die
+}