Move Android version stamping from an exec_script -> build rule

BUG=

Review URL: https://codereview.chromium.org/1229073003

Cr-Original-Commit-Position: refs/heads/master@{#338292}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5f3dec8ead48312eea0b4a27329c4faf231333c7

config/android/rules.gni

@@ -1449,9 +1449,13 @@ template("android_apk") {
       _enable_relocation_packing = true
     }
 
-    _native_lib_version_name = ""
-    if (defined(invoker.native_lib_version_name)) {
-      _native_lib_version_name = invoker.native_lib_version_name
+    _native_lib_version_rule = ""
+    if (defined(invoker.native_lib_version_rule)) {
+      _native_lib_version_rule = invoker.native_lib_version_rule
+    }
+    _native_lib_version_arg = "\"\""
+    if (defined(invoker.native_lib_version_arg)) {
+      _native_lib_version_arg = invoker.native_lib_version_arg
     }
   }
 
@@ -1532,11 +1536,14 @@ template("android_apk") {
       deps = [
         ":$build_config_target",
       ]
+      if (_native_lib_version_rule != "") {
+        deps += [ _native_lib_version_rule ]
+      }
 
       defines = [
         "NATIVE_LIBRARIES_LIST=" +
             "@FileArg($_rebased_build_config:native:java_libraries_list)",
-        "NATIVE_LIBRARIES_VERSION_NUMBER=\"$_native_lib_version_name\"",
+        "NATIVE_LIBRARIES_VERSION_NUMBER=$_native_lib_version_arg",
       ]
       if (_use_chromium_linker) {
         defines += [ "ENABLE_CHROMIUM_LINKER" ]

util/BUILD.gn

@@ -26,3 +26,23 @@ action("webkit_version") {
     rebase_path(output_file, root_build_dir),
   ]
 }
+
+action("chrome_version_json") {
+  script = "version.py"
+  _chrome_version_path = "//chrome/VERSION"
+  inputs = [
+    _chrome_version_path,
+  ]
+  _output_file = "$root_gen_dir/CHROME_VERSION.json"
+  outputs = [
+    _output_file,
+  ]
+  args = [
+    "--file",
+    rebase_path(_chrome_version_path, root_build_dir),
+    "--template",
+    "{\"full-quoted\": \"\\\"@MAJOR@.@MINOR@.@BUILD@.@PATCH@\\\"\"}",
+    "--output",
+    rebase_path(_output_file, root_build_dir),
+  ]
+}