Add targets for generating version files in Windows GN build.

chrome/common/BUILD.gn

Index: chrome/common/BUILD.gn
diff --git a/chrome/common/BUILD.gn b/chrome/common/BUILD.gn
index d6a03e0fc327ee420e593cd2d16d697999e63115..d0a1ae716dcc4515c6f2fd8cb2049c5f03c6eff1 100644
--- a/chrome/common/BUILD.gn
+++ b/chrome/common/BUILD.gn
@@ -266,9 +266,11 @@ static_library("constants") {
     "pref_names.h",
     "widevine_cdm_constants.cc",
     "widevine_cdm_constants.h",
+    "$target_gen_dir/chrome_version.cc",
   ]
 
   deps = [
+    ":make_chrome_version",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//components/bookmarks/common",
@@ -282,6 +284,26 @@ static_library("constants") {
   }
 }
 
+action("make_chrome_version") {
+  script = "//chrome/tools/build/make_version_cc.py"
+  outputs = [
+    "$target_gen_dir/chrome_version.cc",
+  ]
+
+  version_full = exec_script("//build/util/version.py",

[brettw, 2015/01/27 23:58:07]

I think we should be able to work around doing this. Doing all of these scripts
every time GN runs really sucks, since this is really a build step.

The GYP build really likes to do these script calls and I was always able to
work around it. If you look at chrome/version.gni you can see chrome/VERSION
being passed as an arg to the script with the -f flag, which I think will have
the same effect as running the script and passing the result on the command
line.

+                             [
+                               "-f",
+                               rebase_path("//chrome/VERSION", root_build_dir),
+                               "-t @MAJOR@.@MINOR@.@BUILD@.@PATCH@",

[Slava Chigrin, 2015/01/26 23:29:09]

See
https://code.google.com/p/chromium/codesearch#chromium/src/build/util/version...

+                             ],
+                             "trim string",
+                             [ "//chrome/VERSION" ])
+  args = [
+    rebase_path("$target_gen_dir/chrome_version.cc", root_build_dir),
+    "$version_full",

[Slava Chigrin, 2015/01/26 23:29:09]

See
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/common_cons...

+  ]
+}
+
 source_set("test_support") {
   testonly = true
   visibility = [ "//chrome/test:test_support" ]