Move MediaKeySession timer to frame-specific TaskRunnerTimer.

third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp

Index: third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
diff --git a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
index ec57adb2d1bcfa4d4735e132f89ff9e7728e7b3a..46f28d63894b5c71ca8646dadd8e09f176c96f14 100644
--- a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
+++ b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
@@ -33,6 +33,7 @@
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/events/Event.h"
 #include "core/events/GenericEventQueue.h"
 #include "modules/encryptedmedia/ContentDecryptionModuleResultPromise.h"
@@ -374,7 +375,10 @@ MediaKeySession::MediaKeySession(ScriptState* scriptState,
       m_closedPromise(new ClosedPromise(scriptState->getExecutionContext(),
                                         this,
                                         ClosedPromise::Closed)),
-      m_actionTimer(this, &MediaKeySession::actionTimerFired) {
+      m_actionTimer(
+          TaskRunnerHelper::get(TaskType::MiscPlatformAPI, scriptState),
+          this,
+          &MediaKeySession::actionTimerFired) {
   DVLOG(MEDIA_KEY_SESSION_LOG_LEVEL) << __func__ << "(" << this << ")";
   InstanceCounters::incrementCounter(InstanceCounters::MediaKeySessionCounter);