Convert PageLoadMetrics to Mojo

components/page_load_metrics/common/BUILD.gn

Index: components/page_load_metrics/common/BUILD.gn
diff --git a/components/page_load_metrics/common/BUILD.gn b/components/page_load_metrics/common/BUILD.gn
index 8ba2aad4599b5c77c6530deb8677c1274429f618..73580196f0db92aaf683c58ea5b7b093d5ddb859 100644
--- a/components/page_load_metrics/common/BUILD.gn
+++ b/components/page_load_metrics/common/BUILD.gn
@@ -2,11 +2,13 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//mojo/public/tools/bindings/mojom.gni")
+
 # GYP version: components/page_load_metrics.gypi:page_load_metrics_common
 static_library("common") {
   sources = [
-    "page_load_metrics_messages.cc",
-    "page_load_metrics_messages.h",
+    "page_load_metrics_param_traits.cc",
+    "page_load_metrics_param_traits.h",
     "page_load_timing.cc",
     "page_load_timing.h",
   ]
@@ -15,3 +17,9 @@ static_library("common") {
     "//ipc",
   ]
 }
+
+mojom("page_load_metrics_mojom") {
+  sources = [
+    "page_load_metrics.mojom",
+  ]
+}