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..5ba716eaa25f118b084be71a538968251b5e53af 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",

[brettw, 2015/01/28 21:06:45]

A slightly more robust way of doing this is to move the process_version call
above this target, and do:
    ...(sources)...
  ] + get_target_outputs(":make_chrome_version")

[Slava Chigrin, 2015/01/29 13:13:22]

Done. Added that as separate line since in other case gn format re-formats all
sources[] list in a bit weird way.

   ]
 
   deps = [
+    ":make_chrome_version",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//components/bookmarks/common",
@@ -282,6 +284,11 @@ static_library("constants") {
   }
 }
 
+process_version("make_chrome_version") {
+  source = "chrome_version.cc.version"
+  output = "$target_gen_dir/chrome_version.cc"
+}
+
 source_set("test_support") {
   testonly = true
   visibility = [ "//chrome/test:test_support" ]