diff --git a/dom/chrome-webidl/ChromeUtils.webidl b/dom/chrome-webidl/ChromeUtils.webidl
index 94443d38883a..57a2a7c63f1d 100644
--- a/dom/chrome-webidl/ChromeUtils.webidl
+++ b/dom/chrome-webidl/ChromeUtils.webidl
@@ -1164,4 +1164,5 @@ dictionary CDMInformation {
   required DOMString capabilities;
   required boolean clearlead;
   required boolean isHDCP22Compatible;
+  required boolean isHardwareDecryption;
 };
diff --git a/dom/media/eme/KeySystemConfig.cpp b/dom/media/eme/KeySystemConfig.cpp
index cc2c36366943..d194cb8a0f32 100644
--- a/dom/media/eme/KeySystemConfig.cpp
+++ b/dom/media/eme/KeySystemConfig.cpp
@@ -313,8 +313,10 @@ void KeySystemConfig::GetGMPKeySystemConfigs(dom::Promise* aPromise) {
             info->mKeySystemName = config.mKeySystem;
             info->mCapabilities = config.GetDebugInfo();
             info->mClearlead = DoesKeySystemSupportClearLead(config.mKeySystem);
-            // TODO : ask real CDM
+            // TODO : ask real CDM for HDCP
             info->mIsHDCP22Compatible = false;
+            // GMP-based CDM doesn't support hardware decryption.
+            info->mIsHardwareDecryption = false;
           }
           promise->MaybeResolve(cdmInfo);
         } else {
diff --git a/ipc/glue/UtilityAudioDecoderChild.cpp b/ipc/glue/UtilityAudioDecoderChild.cpp
index 65ba6ae987d6..182520ea175a 100644
--- a/ipc/glue/UtilityAudioDecoderChild.cpp
+++ b/ipc/glue/UtilityAudioDecoderChild.cpp
@@ -257,6 +257,9 @@ void UtilityAudioDecoderChild::GetKeySystemCapabilities(
           if (capabilities.isHDCP22Compatible()) {
             info->mIsHDCP22Compatible = *capabilities.isHDCP22Compatible();
           }
+          if (capabilities.isHardwareDecryption()) {
+            info->mIsHardwareDecryption = true;
+          }
         }
         promise->MaybeResolve(cdmInfo);
       },