Bug 1766509. Add telemetry to track whether H264 is enabled. r=ng

Differential Revision: https://phabricator.services.mozilla.com/D144827

dom/media/webrtc/jsapi/PeerConnectionImpl.cpp

@@ -587,11 +587,18 @@ class ConfigureCodec {
     mSoftwareH264Enabled = PeerConnectionCtx::GetInstance()->gmpHasH264();
 
     if (WebrtcVideoConduit::HasH264Hardware()) {
+      Telemetry::Accumulate(Telemetry::WEBRTC_HAS_H264_HARDWARE, true);
       branch->GetBoolPref("media.webrtc.hw.h264.enabled",
                           &mHardwareH264Enabled);
     }
 
     mH264Enabled = mHardwareH264Enabled || mSoftwareH264Enabled;
+    Telemetry::Accumulate(Telemetry::WEBRTC_SOFTWARE_H264_ENABLED,
+                          mSoftwareH264Enabled);
+    Telemetry::Accumulate(Telemetry::WEBRTC_HARDWARE_H264_ENABLED,
+                          mHardwareH264Enabled);
+    Telemetry::Accumulate(Telemetry::WEBRTC_H264_ENABLED,
+                          mH264Enabled);
 
     branch->GetIntPref("media.navigator.video.h264.level", &mH264Level);
     mH264Level &= 0xFF;

toolkit/components/telemetry/Histograms.json

@@ -11258,6 +11258,46 @@
     "n_values": 8,
     "description": "Type of call: (Bitmask) Audio = 1, Video = 2, DataChannels = 4"
   },
+  "WEBRTC_SOFTWARE_H264_ENABLED": {
+    "record_in_processes": ["main", "content"],
+    "products": ["firefox", "fennec"],
+    "alert_emails": ["webrtc-telemetry-alerts@mozilla.com"],
+    "expires_in_version": "never",
+    "kind": "boolean",
+    "bug_numbers": [1766509],
+    "releaseChannelCollection": "opt-out",
+    "description": "Whether hardware H264 is enabled"
+  },
+  "WEBRTC_HAS_H264_HARDWARE": {
+    "record_in_processes": ["main", "content"],
+    "products": ["firefox", "fennec"],
+    "alert_emails": ["webrtc-telemetry-alerts@mozilla.com"],
+    "expires_in_version": "never",
+    "kind": "boolean",
+    "bug_numbers": [1766509],
+    "releaseChannelCollection": "opt-out",
+    "description": "Whether the user has H264 hardware"
+  },
+  "WEBRTC_HARDWARE_H264_ENABLED": {
+    "record_in_processes": ["main", "content"],
+    "products": ["firefox", "fennec"],
+    "alert_emails": ["webrtc-telemetry-alerts@mozilla.com"],
+    "expires_in_version": "never",
+    "kind": "boolean",
+    "bug_numbers": [1766509],
+    "releaseChannelCollection": "opt-out",
+    "description": "Whether software H264 is enabled"
+  },
+  "WEBRTC_H264_ENABLED": {
+    "record_in_processes": ["main", "content"],
+    "products": ["firefox", "fennec"],
+    "alert_emails": ["webrtc-telemetry-alerts@mozilla.com"],
+    "expires_in_version": "never",
+    "kind": "boolean",
+    "bug_numbers": [1766509],
+    "releaseChannelCollection": "opt-out",
+    "description": "Whether any kind of H264 is enabled"
+  },
   "MEDIA_RECORDER_RECORDING_DURATION": {
     "record_in_processes": ["main", "content"],
     "products": ["firefox", "fennec"],