Bug 1650981 - Send TIME_TO_FIRST_INTERACTION_MS only from the top level content. r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D83214

layout/base/nsPresContext.cpp

@@ -1269,19 +1269,21 @@ void nsPresContext::RecordInteractionTime(InteractionType aType,
 
   // Record the interaction time if it occurs after the first paint
   // of the top level content document.
-  nsPresContext* topContentPresContext =
+  nsPresContext* inProcessRootPresContext =
       GetInProcessRootContentDocumentPresContext();
 
-  if (!topContentPresContext) {
-    // There is no top content pres context so we don't care
-    // about the interaction time. Record a value anyways to avoid
-    // trying to find the top content pres context in future interactions.
+  if (!inProcessRootPresContext ||
+      !inProcessRootPresContext->IsRootContentDocumentCrossProcess()) {
+    // There is no top content pres context, or we are in a cross process
+    // document so we don't care about the interaction time. Record a value
+    // anyways to avoid trying to find the top content pres context in future
+    // interactions.
     interactionTime = TimeStamp::Now();
     return;
   }
 
-  if (topContentPresContext->mFirstNonBlankPaintTime.IsNull() ||
-      topContentPresContext->mFirstNonBlankPaintTime > aTimeStamp) {
+  if (inProcessRootPresContext->mFirstNonBlankPaintTime.IsNull() ||
+      inProcessRootPresContext->mFirstNonBlankPaintTime > aTimeStamp) {
     // Top content pres context has not had a non-blank paint yet
     // or the event timestamp is before the first non-blank paint,
     // so don't record interaction time.
@@ -1301,7 +1303,7 @@ void nsPresContext::RecordInteractionTime(InteractionType aType,
   interactionTime = TimeStamp::Now();
   // Only the top level content pres context reports first interaction
   // time to telemetry (if it hasn't already done so).
-  if (this == topContentPresContext) {
+  if (this == inProcessRootPresContext) {
     if (Telemetry::CanRecordExtended()) {
       double millis =
           (interactionTime - mFirstNonBlankPaintTime).ToMilliseconds();
@@ -1312,7 +1314,7 @@ void nsPresContext::RecordInteractionTime(InteractionType aType,
       }
     }
   } else {
-    topContentPresContext->RecordInteractionTime(aType, aTimeStamp);
+    inProcessRootPresContext->RecordInteractionTime(aType, aTimeStamp);
   }
 }