Reset the nesting level for setInterval after completion.

third_party/WebKit/Source/core/frame/DOMTimer.cpp

Index: third_party/WebKit/Source/core/frame/DOMTimer.cpp
diff --git a/third_party/WebKit/Source/core/frame/DOMTimer.cpp b/third_party/WebKit/Source/core/frame/DOMTimer.cpp
index e38ac74e6489aa12c3e4eb579ca5f997bd5976ab..fbd084519f8036a2c1367078a115dadf1154d0d8 100644
--- a/third_party/WebKit/Source/core/frame/DOMTimer.cpp
+++ b/third_party/WebKit/Source/core/frame/DOMTimer.cpp
@@ -157,8 +157,15 @@ void DOMTimer::fired() {
         augmentRepeatInterval(minimumInterval - repeatInterval());
     }
 
+    // Get ExecutionContext early as it might be cleared during
+    // action->execute().
+    ExecutionContext* executionContext = getExecutionContext();

[jochen (gone - plz use gerrit), 2017/02/15 15:26:48]

sorry for not catching this earlier, but |context| is already capturing
executionContext, no need to create a duplicate variable here

[Dan Elphick, 2017/02/15 16:24:52]

Done.

+
     // No access to member variables after this point, it can delete the timer.
     m_action->execute(context);
+
+    executionContext->timers()->setTimerNestingLevel(0);
+
     return;
   }