Include googleurl via a proxy header

This allows us to apply pragmas / change paths more easily.

PiperOrigin-RevId: 576173302
diff --git a/build/source_list.bzl b/build/source_list.bzl
index a766578..1038ec4 100644
--- a/build/source_list.bzl
+++ b/build/source_list.bzl
@@ -20,6 +20,7 @@
     "common/platform/api/quiche_export.h",
     "common/platform/api/quiche_flag_utils.h",
     "common/platform/api/quiche_flags.h",
+    "common/platform/api/quiche_googleurl.h",
     "common/platform/api/quiche_header_policy.h",
     "common/platform/api/quiche_hostname_utils.h",
     "common/platform/api/quiche_iovec.h",
@@ -1398,6 +1399,7 @@
     "common/platform/default/quiche_platform_impl/quiche_export_impl.h",
     "common/platform/default/quiche_platform_impl/quiche_flag_utils_impl.h",
     "common/platform/default/quiche_platform_impl/quiche_flags_impl.h",
+    "common/platform/default/quiche_platform_impl/quiche_googleurl_impl.h",
     "common/platform/default/quiche_platform_impl/quiche_header_policy_impl.h",
     "common/platform/default/quiche_platform_impl/quiche_iovec_impl.h",
     "common/platform/default/quiche_platform_impl/quiche_logging_impl.h",