Add next_version_mini_installer target.

chrome/installer/mini_installer/BUILD.gn

Index: chrome/installer/mini_installer/BUILD.gn
diff --git a/chrome/installer/mini_installer/BUILD.gn b/chrome/installer/mini_installer/BUILD.gn
index 643d7bd8bde133015266bb3fe23ea1beee91ed26..ef9c1b73137fc60702b1d998ef16640d09412215 100644
--- a/chrome/installer/mini_installer/BUILD.gn
+++ b/chrome/installer/mini_installer/BUILD.gn
@@ -204,3 +204,24 @@ executable("mini_installer") {
     "//build/win:default_exe_manifest",
   ]
 }
+
+action("next_version_mini_installer") {
+  script = "generate_next_version_mini_installer.py"

[grt (UTC plus 2), 2016/04/20 20:00:42]

is there no way to run the command without wrapping it in python?

[fdoray, 2016/04/20 20:42:44]

GN prepends the Python path to the provided script when it builds the command
for an "action" target [1]. I tried to put alternate_version_generator.exe here
but it didn't work.

[1]
https://code.google.com/p/chromium/codesearch#chromium/src/tools/gn/ninja_act...

[Dirk Pranke, 2016/04/20 21:33:33]

Right, GN only supports calling out to python scripts.

+  testonly = true
+  next_version_mini_installer_exe = "next_version_mini_installer.exe"

[Dirk Pranke, 2016/04/20 21:33:33]

Nit: this could be "$target_name.exe" instead, or you could just use
"$target_name.exe" below.

[fdoray, 2016/04/21 13:14:13]

Done.

+  inputs = [
+    "$root_out_dir/alternate_version_generator.exe",
+    "$root_out_dir/mini_installer.exe",
+  ]
+  outputs = [
+    "$root_out_dir/$next_version_mini_installer_exe",
+  ]
+  args = [
+    "--out",
+    next_version_mini_installer_exe,
+  ]
+  deps = [
+    ":mini_installer",
+    "//chrome/installer/test:alternate_version_generator",
+  ]
+}