Add resource whitelisting to android_webview pak files.

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index 36cad983fc6a72f38b796c113764bedccb0574d0..eddc62a86742ec01a682f6ac51ba0dfb036afdad 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -15,6 +15,7 @@ import("//chrome/chrome_paks.gni")
 import("//chrome/common/features.gni")
 import("//chrome/process_version_rc_template.gni")
 import("//third_party/widevine/cdm/widevine.gni")
+import("//tools/resources/generate_resource_whitelist.gni")
 import("//ui/base/ui_features.gni")
 import("//v8/gni/v8.gni")
 
@@ -1476,33 +1477,12 @@ if (is_android) {
 }
 
 if (enable_resource_whitelist_generation) {
-  action("resource_whitelist") {
-    assert(is_android,
-           "Resource whitelist currently implemented only on Android")
-
+  generate_resource_whitelist("resource_whitelist") {
     deps = [
       "//chrome/android:chrome",
     ]
-    script = "//tools/resources/generate_resource_whitelist.py"
-
-    _infile = "$root_out_dir/libchrome$shlib_extension.whitelist"
-    inputs = [
-      _infile,
-    ]
-
-    _outfile = chrome_resource_whitelist
-    outputs = [
-      _outfile,
-    ]
-
-    args = [
-      "-i",
-      rebase_path(_infile, root_build_dir),
-      "-o",
-      rebase_path(_outfile, root_build_dir),
-      "--out-dir=.",
-      "--use-existing-resource-ids",
-    ]
+    input = "$root_out_dir/libchrome$shlib_extension.whitelist"
+    output = chrome_resource_whitelist
   }
 }