mojo: Update gyp python targets to specify their equivalent gn targets.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/566333002

Cr-Commit-Position: refs/heads/master@{#295036}

mojo/mojo.gyp

@@ -556,6 +556,7 @@
     ['component!="shared_library" and OS=="linux"', {
       'targets': [
         {
+          # GN version: //mojo/public/python:system
           'target_name': 'mojo_python_system',
           'variables': {
             'python_base_module': 'mojo',
@@ -571,6 +572,7 @@
           'includes': [ '../third_party/cython/cython_compiler.gypi' ],
         },
         {
+          # GN version: //mojo/python:embedder
           'target_name': 'mojo_python_embedder',
           'type': 'loadable_module',
           'variables': {
@@ -586,6 +588,7 @@
           'includes': [ '../third_party/cython/cython_compiler.gypi' ],
         },
         {
+          # GN version: //mojo/public/python:bindings
           'target_name': 'mojo_python_bindings',
           'type': 'none',
           'variables': {
@@ -602,6 +605,7 @@
           'includes': [ '../third_party/cython/python_module.gypi' ],
         },
         {
+          # GN version: //mojo/python
           'target_name': 'mojo_python',
           'type': 'none',
           'variables': {

mojo/public/python/BUILD.gn

@@ -12,6 +12,7 @@ group("python") {
   ]
 }
 
+# GYP version: mojo.gyp:mojo_python_system
 python_binary_module("system") {
   python_base_module = "mojo"
   sources = [
@@ -33,6 +34,7 @@ copy("base") {
   ]
 }
 
+# GYP version: mojo.gyp:mojo_python_bindings
 copy("bindings") {
   sources = [
     "mojo/bindings/__init__.py",

mojo/python/BUILD.gn

@@ -4,12 +4,15 @@
 
 import("//third_party/cython/rules.gni")
 
+# GYP version: mojo/mojo.gyp:mojo_python
 group("python") {
   deps = [
     ":embedder",
+    "//mojo/public/python",
   ]
 }
 
+# GYP version: mojo/mojo.gyp:mojo_python_embedder
 python_binary_module("embedder") {
   python_base_module = "mojo"
   sources = [