Refactor the python system_impl module.

mojo/public/python/BUILD.gn

Index: mojo/public/python/BUILD.gn
diff --git a/mojo/public/python/BUILD.gn b/mojo/public/python/BUILD.gn
index 51bd6eb8599aaf0bf67ed84503be83fb63f3bca9..626def869e2e47940ce24d9eeeff635724e62060 100644
--- a/mojo/public/python/BUILD.gn
+++ b/mojo/public/python/BUILD.gn
@@ -16,44 +16,65 @@ group("python") {
 # GYP version: mojo.gyp:mojo_python_system
 python_binary_module("system") {
   python_base_module = "mojo"
-  sources = [
+  configs = [ "../build/config:mojo_sdk" ]
+  deps = [
+    ":system_embedded",
+  ]
+}
+
+python_binary_source_set("system_embedded") {
+  cython_sources = [
+    "mojo/c_async_waiter.pxd",
     "mojo/c_core.pxd",
+    "mojo/c_thunks.pxd",
     "mojo/system.pyx",
   ]
-  configs = [ "../build/config:mojo_sdk" ]
   deps = [
-    ":base",
-    "../c/environment",
     "../c/system",
-    "../cpp/environment:standalone",
+    "../cpp/bindings:callback",
     "../cpp/system",
     "../cpp/utility",
-    "../cpp/bindings:callback",
     "../platform/native:system",
+    ":base",

[qsr, 2014/12/12 14:27:06]

Local dependencies must be first. Here and below

[etiennej, 2014/12/12 15:29:36]

Done.

   ]
 }
 
 python_binary_module("system_impl") {
   python_base_module = "mojo"
-  sources = [
-    "mojo/c_core.pxd",
+  cython_sources = [
     "mojo/c_environment.pxd",
+    "mojo/c_thunks.pxd",
     "mojo/system_impl.pyx",
   ]
-  additional_sources = [
+  sources = [
     "src/python_system_helper.cc",
     "src/python_system_helper.h",
   ]
   configs = [ "../build/config:mojo_sdk" ]
   deps = [
-    ":base",
     "../c/environment",
     "../c/system",
+    "../cpp/bindings:callback",
     "../cpp/environment:standalone",
     "../cpp/system",
     "../cpp/utility",
-    "../cpp/bindings:callback",
     "../platform/native:system",
+    ":base",
+    ":python_common",
+  ]
+}
+
+python_binary_source_set("python_common") {
+  sources = [
+    "src/common.cc",
+    "src/common.h",
+  ]
+  deps = [
+    "../c/environment:environment",
+    "../cpp/bindings:callback",
+    "../cpp/environment:environment",
+    "../cpp/system:system",
+    "../cpp/utility",
   ]
 }