[heap] Remove unused step_size_in_bytes in AdvanceIncrementalMarking.

BUG=

Review URL: https://codereview.chromium.org/1844293005

Cr-Commit-Position: refs/heads/master@{#35238}

src/heap/heap.cc

@@ -928,7 +928,7 @@ void Heap::ReportExternalMemoryPressure(const char* gc_reason) {
     double deadline = MonotonicallyIncreasingTimeInMs() +
                       FLAG_external_allocation_limit_incremental_time;
     incremental_marking()->AdvanceIncrementalMarking(
-        0, deadline,
+        deadline,
         IncrementalMarking::StepActions(IncrementalMarking::GC_VIA_STACK_GUARD,
                                         IncrementalMarking::FORCE_MARKING,
                                         IncrementalMarking::FORCE_COMPLETION));

src/heap/incremental-marking-job.cc

@@ -83,7 +83,7 @@ IncrementalMarkingJob::IdleTask::Progress IncrementalMarkingJob::IdleTask::Step(
   }
   const double remaining_idle_time_in_ms =
       incremental_marking->AdvanceIncrementalMarking(
-          0, deadline_in_ms, IncrementalMarking::IdleStepActions());
+          deadline_in_ms, IncrementalMarking::IdleStepActions());
   if (remaining_idle_time_in_ms > 0.0) {
     heap->TryFinalizeIdleIncrementalMarking(remaining_idle_time_in_ms);
   }
@@ -121,7 +121,7 @@ void IncrementalMarkingJob::DelayedTask::Step(Heap* heap) {
   double deadline =
       heap->MonotonicallyIncreasingTimeInMs() + kIncrementalMarkingDelayMs;
   heap->incremental_marking()->AdvanceIncrementalMarking(
-      0, deadline, i::IncrementalMarking::StepActions(
+      deadline, i::IncrementalMarking::StepActions(
                     i::IncrementalMarking::NO_GC_VIA_STACK_GUARD,
                     i::IncrementalMarking::FORCE_MARKING,
                     i::IncrementalMarking::FORCE_COMPLETION));

src/heap/incremental-marking.cc

@@ -1015,22 +1015,18 @@ void IncrementalMarking::Epilogue() {
   incremental_marking_finalization_rounds_ = 0;
 }
 
-
 double IncrementalMarking::AdvanceIncrementalMarking(
-    intptr_t step_size_in_bytes, double deadline_in_ms,
-    IncrementalMarking::StepActions step_actions) {
+    double deadline_in_ms, IncrementalMarking::StepActions step_actions) {
   DCHECK(!IsStopped());
 
-  if (step_size_in_bytes == 0) {
-    step_size_in_bytes = GCIdleTimeHandler::EstimateMarkingStepSize(
+  intptr_t step_size_in_bytes = GCIdleTimeHandler::EstimateMarkingStepSize(
       GCIdleTimeHandler::kIncrementalMarkingStepTimeInMs,
       heap()
           ->tracer()
           ->FinalIncrementalMarkCompactSpeedInBytesPerMillisecond());
-  }
-
   double remaining_time_in_ms = 0.0;
   intptr_t bytes_processed = 0;
+
   do {
     bytes_processed =
         Step(step_size_in_bytes, step_actions.completion_action,

src/heap/incremental-marking.h

@@ -106,13 +106,10 @@ class IncrementalMarking {
 
   void Epilogue();
 
-  // Performs incremental marking steps of step_size_in_bytes as long as
-  // deadline_in_ms is not reached. step_size_in_bytes can be 0 to compute
-  // an estimate increment. Returns the remaining time that cannot be used
-  // for incremental marking anymore because a single step would exceed the
-  // deadline.
-  double AdvanceIncrementalMarking(intptr_t step_size_in_bytes,
-                                   double deadline_in_ms,
+  // Performs incremental marking steps until deadline_in_ms is reached. It
+  // returns the remaining time that cannot be used for incremental marking
+  // anymore because a single step would exceed the deadline.
+  double AdvanceIncrementalMarking(double deadline_in_ms,
                                    StepActions step_actions);
 
   // It's hard to know how much work the incremental marker should do to make

src/heap/memory-reducer.cc

@@ -84,7 +84,7 @@ void MemoryReducer::NotifyTimer(const Event& event) {
       double deadline = heap()->MonotonicallyIncreasingTimeInMs() +
                         kIncrementalMarkingDelayMs;
       heap()->incremental_marking()->AdvanceIncrementalMarking(
-          0, deadline, i::IncrementalMarking::StepActions(
+          deadline, i::IncrementalMarking::StepActions(
                         i::IncrementalMarking::NO_GC_VIA_STACK_GUARD,
                         i::IncrementalMarking::FORCE_MARKING,
                         i::IncrementalMarking::FORCE_COMPLETION));

test/cctest/heap/test-heap.cc

@@ -4644,7 +4644,7 @@ TEST(LargeObjectSlotRecording) {
   // Start incremental marking to active write barrier.
   SimulateIncrementalMarking(heap, false);
   heap->incremental_marking()->AdvanceIncrementalMarking(
-      10000000, 10000000, IncrementalMarking::IdleStepActions());
+      10000000, IncrementalMarking::IdleStepActions());
 
   // Create references from the large object to the object on the evacuation
   // candidate.