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

chrome/renderer/page_load_metrics/page_timing_metrics_sender.cc

Index: chrome/renderer/page_load_metrics/page_timing_metrics_sender.cc
diff --git a/chrome/renderer/page_load_metrics/page_timing_metrics_sender.cc b/chrome/renderer/page_load_metrics/page_timing_metrics_sender.cc
index f4a88559e9c5980815b4c5eca7d724d0f968a8e8..ddf83861a883daba0b711a5d0db467ea93beefa1 100644
--- a/chrome/renderer/page_load_metrics/page_timing_metrics_sender.cc
+++ b/chrome/renderer/page_load_metrics/page_timing_metrics_sender.cc
@@ -23,13 +23,14 @@ PageTimingMetricsSender::PageTimingMetricsSender(
     IPC::Sender* ipc_sender,
     int routing_id,
     std::unique_ptr<base::Timer> timer,
-    const PageLoadTiming& initial_timing)
+    mojom::PageLoadTimingPtr initial_timing)
     : ipc_sender_(ipc_sender),
       routing_id_(routing_id),
       timer_(std::move(timer)),
-      last_timing_(initial_timing),
-      metadata_(PageLoadMetadata()) {
-  if (!initial_timing.IsEmpty()) {
+      last_timing_(std::move(initial_timing)),
+      metadata_(mojom::PageLoadMetadata()) {
+  if (!IsEmpty(*last_timing_)) {
+    // Send an initial IPC relatively early to help track aborts.

[Bryan McQuade, 2017/05/16 01:58:55]

looks like this comment was removed in a recent change. you can remove it here.

[lpy, 2017/05/16 18:08:55]

Done.

     EnsureSendTimer();
   }
 }
@@ -51,19 +52,19 @@ void PageTimingMetricsSender::DidObserveLoadingBehavior(
   EnsureSendTimer();
 }
 
-void PageTimingMetricsSender::Send(const PageLoadTiming& timing) {
-  if (timing == last_timing_)
+void PageTimingMetricsSender::Send(mojom::PageLoadTimingPtr timing) {
+  if (last_timing_->Equals(*timing))
     return;
 
   // We want to make sure that each PageTimingMetricsSender is associated
   // with a distinct page navigation. Because we reset the object on commit,
   // we can trash last_timing_ on a provisional load before SendNow() fires.
-  if (!last_timing_.navigation_start.is_null() &&
-      last_timing_.navigation_start != timing.navigation_start) {
+  if (!last_timing_->navigation_start.is_null() &&
+      last_timing_->navigation_start != timing->navigation_start) {
     return;
   }
 
-  last_timing_ = timing;
+  last_timing_ = std::move(timing);
   EnsureSendTimer();
 }
 
@@ -82,7 +83,7 @@ void PageTimingMetricsSender::EnsureSendTimer() {
 void PageTimingMetricsSender::SendNow() {
   have_sent_ipc_ = true;
   ipc_sender_->Send(new PageLoadMetricsMsg_TimingUpdated(
-      routing_id_, last_timing_, metadata_));
+      routing_id_, *last_timing_, metadata_));
 }
 
 }  // namespace page_load_metrics