Bug 1787561 Part 2: Expose HDR telemetry to HTMLMediaElement as a Chrome property. r=alwu,emilio

This is necessary scaffolding for testing of the HDR telemetry in a way
that involves the RDD process. This is important for matching real-world
conditions.

Depends on D155902

Differential Revision: https://phabricator.services.mozilla.com/D156245

dom/html/HTMLMediaElement.cpp

@@ -2080,6 +2080,10 @@ double HTMLMediaElement::TotalVideoPlayTime() const {
   return mDecoder ? mDecoder->GetTotalVideoPlayTimeInSeconds() : -1.0;
 }
 
+double HTMLMediaElement::TotalVideoHDRPlayTime() const {
+  return mDecoder ? mDecoder->GetTotalVideoHDRPlayTimeInSeconds() : -1.0;
+}
+
 double HTMLMediaElement::VisiblePlayTime() const {
   return mDecoder ? mDecoder->GetVisibleVideoPlayTimeInSeconds() : -1.0;
 }

dom/html/HTMLMediaElement.h

@@ -655,6 +655,7 @@ class HTMLMediaElement : public nsGenericHTMLElement,
   // These functions return accumulated time, which are used for the telemetry
   // usage. Return -1 for error.
   double TotalVideoPlayTime() const;
+  double TotalVideoHDRPlayTime() const;
   double VisiblePlayTime() const;
   double InvisiblePlayTime() const;
   double VideoDecodeSuspendedTime() const;

dom/media/MediaDecoder.cpp

@@ -1498,6 +1498,10 @@ double MediaDecoder::GetTotalVideoPlayTimeInSeconds() const {
   return mTelemetryProbesReporter->GetTotalVideoPlayTimeInSeconds();
 }
 
+double MediaDecoder::GetTotalVideoHDRPlayTimeInSeconds() const {
+  return mTelemetryProbesReporter->GetTotalVideoHDRPlayTimeInSeconds();
+}
+
 double MediaDecoder::GetVisibleVideoPlayTimeInSeconds() const {
   return mTelemetryProbesReporter->GetVisibleVideoPlayTimeInSeconds();
 }

dom/media/MediaDecoder.h

@@ -730,6 +730,7 @@ class MediaDecoder : public DecoderDoctorLifeLogger<MediaDecoder> {
 
   // Those methods exist to report telemetry related metrics.
   double GetTotalVideoPlayTimeInSeconds() const;
+  double GetTotalVideoHDRPlayTimeInSeconds() const;
   double GetVisibleVideoPlayTimeInSeconds() const;
   double GetInvisibleVideoPlayTimeInSeconds() const;
   double GetVideoDecodeSuspendedTimeInSeconds() const;

dom/webidl/HTMLMediaElement.webidl

@@ -235,6 +235,9 @@ partial interface HTMLMediaElement {
   [ChromeOnly]
   readonly attribute double totalVideoPlayTime;
 
+  [ChromeOnly]
+  readonly attribute double totalVideoHDRPlayTime;
+
   [ChromeOnly]
   readonly attribute double visiblePlayTime;