Reland "Use v8 Microtask Queue"

LayoutTests/inspector/sources/debugger/async-callstack-mutation-observer-expected.txt

Index: LayoutTests/inspector/sources/debugger/async-callstack-mutation-observer-expected.txt
diff --git a/LayoutTests/inspector/sources/debugger/async-callstack-mutation-observer-expected.txt b/LayoutTests/inspector/sources/debugger/async-callstack-mutation-observer-expected.txt
index d6b06a330e0be16fad591eb8775b41f9ed600c5c..6c58b869084e6a244f6cb59f11ecb281907c389e 100644
--- a/LayoutTests/inspector/sources/debugger/async-callstack-mutation-observer-expected.txt
+++ b/LayoutTests/inspector/sources/debugger/async-callstack-mutation-observer-expected.txt
@@ -5,6 +5,7 @@ Set timer for test function.
 Captured call stacks in no particular order:
 Call stack:
     0) mutationCallback (async-callstack-mutation-observer.html:21)
+    1) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
@@ -13,6 +14,7 @@ Call stack:
 
 Call stack:
     0) mutationCallback (async-callstack-mutation-observer.html:21)
+    1) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations2 (async-callstack-mutation-observer.html:64)
     1) timeout2 (async-callstack-mutation-observer.html:57)
@@ -23,9 +25,11 @@ Call stack:
 
 Call stack:
     0) nestedMutationCallback (async-callstack-mutation-observer.html:28)
+    1) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) mutationCallback (async-callstack-mutation-observer.html:20)
+    2) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
@@ -34,14 +38,17 @@ Call stack:
 
 Call stack:
     0) nestedMutationCallback (async-callstack-mutation-observer.html:28)
+    1) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations2 (async-callstack-mutation-observer.html:64)
     1) timeoutFromNestedMutation (async-callstack-mutation-observer.html:76)
     [setTimeout]
     0) nestedMutationCallback (async-callstack-mutation-observer.html:30)
+    1) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) mutationCallback (async-callstack-mutation-observer.html:20)
+    2) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
@@ -50,6 +57,7 @@ Call stack:
     0) timeoutFromMutation (async-callstack-mutation-observer.html:70)
     [setTimeout]
     0) mutationCallback (async-callstack-mutation-observer.html:23)
+    1) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
@@ -60,9 +68,11 @@ Call stack:
     0) timeoutFromNestedMutation (async-callstack-mutation-observer.html:75)
     [setTimeout]
     0) nestedMutationCallback (async-callstack-mutation-observer.html:30)
+    1) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) mutationCallback (async-callstack-mutation-observer.html:20)
+    2) RunMicrotasks ((internal script):(line number))
     [Mutation]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)