Convert PageLoadMetrics to Mojo

components/page_load_metrics/renderer/metrics_render_frame_observer.h

Index: components/page_load_metrics/renderer/metrics_render_frame_observer.h
diff --git a/components/page_load_metrics/renderer/metrics_render_frame_observer.h b/components/page_load_metrics/renderer/metrics_render_frame_observer.h
index 3648c805c8fde1560bd4b078a23563f76e0aabc4..ebfbf6de04fe494136e85aa4d199663d90780f62 100644
--- a/components/page_load_metrics/renderer/metrics_render_frame_observer.h
+++ b/components/page_load_metrics/renderer/metrics_render_frame_observer.h
@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "components/page_load_metrics/common/page_load_metrics.mojom.h"
 #include "components/page_load_metrics/common/page_load_timing.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h"
@@ -25,6 +26,10 @@ class PageTimingMetricsSender;
 class MetricsRenderFrameObserver : public content::RenderFrameObserver {
  public:
   explicit MetricsRenderFrameObserver(content::RenderFrame* render_frame);
+  // For testing only.
+  MetricsRenderFrameObserver(
+      content::RenderFrame* render_frame,
+      page_load_metrics::mojom::PageLoadMetricsPtr page_load_metrics);
   ~MetricsRenderFrameObserver() override;
 
   // RenderFrameObserver implementation
@@ -36,6 +41,9 @@ class MetricsRenderFrameObserver : public content::RenderFrameObserver {
   void OnDestruct() override;
 
  private:
+  // Must be destroyed after |page_timing_metrics_sender_|.
+  page_load_metrics::mojom::PageLoadMetricsPtr page_load_metrics_;
+
   // Will be null when we're not actively sending metrics.
   std::unique_ptr<PageTimingMetricsSender> page_timing_metrics_sender_;