[Page Load Metrics] Add mojom file to page load metrics.

chrome/common/page_load_metrics/page_load_metrics_messages.h

Index: chrome/common/page_load_metrics/page_load_metrics_messages.h
diff --git a/chrome/common/page_load_metrics/page_load_metrics_messages.h b/chrome/common/page_load_metrics/page_load_metrics_messages.h
index 82b028d2748cb28962cd5c21c62f43d1ac8d97a4..6853fdf65bfa92e94761ef39f9689b3513debf1b 100644
--- a/chrome/common/page_load_metrics/page_load_metrics_messages.h
+++ b/chrome/common/page_load_metrics/page_load_metrics_messages.h
@@ -6,6 +6,7 @@
 // Multiply-included message file, hence no include guard.
 
 #include "base/time/time.h"
+#include "chrome/common/page_load_metrics/page_load_metrics_param_traits.h"
 #include "chrome/common/page_load_metrics/page_load_timing.h"
 #include "ipc/ipc_message_macros.h"
 
@@ -13,13 +14,13 @@
 
 // See comments in page_load_timing.h for details on each field.
 
-IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::DocumentTiming)
+IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::mojom::DocumentTiming)
   IPC_STRUCT_TRAITS_MEMBER(dom_content_loaded_event_start)
   IPC_STRUCT_TRAITS_MEMBER(load_event_start)
   IPC_STRUCT_TRAITS_MEMBER(first_layout)
 IPC_STRUCT_TRAITS_END()
 
-IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::PaintTiming)
+IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::mojom::PaintTiming)
   IPC_STRUCT_TRAITS_MEMBER(first_paint)
   IPC_STRUCT_TRAITS_MEMBER(first_text_paint)
   IPC_STRUCT_TRAITS_MEMBER(first_image_paint)
@@ -27,7 +28,7 @@ IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::PaintTiming)
   IPC_STRUCT_TRAITS_MEMBER(first_meaningful_paint)
 IPC_STRUCT_TRAITS_END()
 
-IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::ParseTiming)
+IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::mojom::ParseTiming)
   IPC_STRUCT_TRAITS_MEMBER(parse_start)
   IPC_STRUCT_TRAITS_MEMBER(parse_stop)
   IPC_STRUCT_TRAITS_MEMBER(parse_blocked_on_script_load_duration)
@@ -38,26 +39,19 @@ IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::ParseTiming)
       parse_blocked_on_script_execution_from_document_write_duration)
 IPC_STRUCT_TRAITS_END()
 
-IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::StyleSheetTiming)
+IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::mojom::StyleSheetTiming)
   IPC_STRUCT_TRAITS_MEMBER(author_style_sheet_parse_duration_before_fcp)
   IPC_STRUCT_TRAITS_MEMBER(update_style_duration_before_fcp)
 IPC_STRUCT_TRAITS_END()
 
-IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::PageLoadTiming)
-  IPC_STRUCT_TRAITS_MEMBER(navigation_start)
-  IPC_STRUCT_TRAITS_MEMBER(response_start)
-  IPC_STRUCT_TRAITS_MEMBER(document_timing)
-  IPC_STRUCT_TRAITS_MEMBER(paint_timing)
-  IPC_STRUCT_TRAITS_MEMBER(parse_timing)
-  IPC_STRUCT_TRAITS_MEMBER(style_sheet_timing)
-IPC_STRUCT_TRAITS_END()
+// page_load_metrics::mojom::PageLoadTiming has custom ParamTraits.
 
-IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::PageLoadMetadata)
+IPC_STRUCT_TRAITS_BEGIN(page_load_metrics::mojom::PageLoadMetadata)
   IPC_STRUCT_TRAITS_MEMBER(behavior_flags)
 IPC_STRUCT_TRAITS_END()
 
 // Sent from renderer to browser process when the PageLoadTiming for the
 // associated frame changed.
 IPC_MESSAGE_ROUTED2(PageLoadMetricsMsg_TimingUpdated,
-                    page_load_metrics::PageLoadTiming,
-                    page_load_metrics::PageLoadMetadata)
+                    page_load_metrics::mojom::PageLoadTiming,
+                    page_load_metrics::mojom::PageLoadMetadata)