Use idle time to make progress on scheduled compilation jobs

test/unittests/compiler-dispatcher/compiler-dispatcher-tracer-unittest.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler-dispatcher/compiler-dispatcher-tracer.h"
 #include "testing/gtest-support.h"
 
 namespace v8 {
 namespace internal {
 
-TEST(CompilerDispatcherTracerTest, EstimateZeroWithoutSamples) {
+TEST(CompilerDispatcherTracerTest, EstimateWithoutSamples) {
   CompilerDispatcherTracer tracer(nullptr);
 
   EXPECT_EQ(0.0, tracer.EstimatePrepareToParseInMs());
-  EXPECT_EQ(0.0, tracer.EstimateParseInMs(0));
-  EXPECT_EQ(0.0, tracer.EstimateParseInMs(42));
+  EXPECT_EQ(1.0, tracer.EstimateParseInMs(0));
+  EXPECT_EQ(1.0, tracer.EstimateParseInMs(42));
   EXPECT_EQ(0.0, tracer.EstimateFinalizeParsingInMs());
   EXPECT_EQ(0.0, tracer.EstimatePrepareToCompileInMs());
-  EXPECT_EQ(0.0, tracer.EstimateCompileInMs(0));
-  EXPECT_EQ(0.0, tracer.EstimateCompileInMs(42));
+  EXPECT_EQ(1.0, tracer.EstimateCompileInMs(0));
+  EXPECT_EQ(1.0, tracer.EstimateCompileInMs(42));
   EXPECT_EQ(0.0, tracer.EstimateFinalizeCompilingInMs());
 }
 
 TEST(CompilerDispatcherTracerTest, Average) {
   CompilerDispatcherTracer tracer(nullptr);
 
   EXPECT_EQ(0.0, tracer.EstimatePrepareToParseInMs());
 
   tracer.RecordPrepareToParse(1.0);
   tracer.RecordPrepareToParse(2.0);
   tracer.RecordPrepareToParse(3.0);
 
   EXPECT_EQ((1.0 + 2.0 + 3.0) / 3, tracer.EstimatePrepareToParseInMs());
 }
 
 TEST(CompilerDispatcherTracerTest, SizeBasedAverage) {
   CompilerDispatcherTracer tracer(nullptr);
 
-  EXPECT_EQ(0.0, tracer.EstimateParseInMs(100));
+  EXPECT_EQ(1.0, tracer.EstimateParseInMs(100));
 
   // All three samples parse 100 units/ms.
   tracer.RecordParse(1.0, 100);
   tracer.RecordParse(2.0, 200);
   tracer.RecordParse(3.0, 300);
 
   EXPECT_EQ(1.0, tracer.EstimateParseInMs(100));
   EXPECT_EQ(5.0, tracer.EstimateParseInMs(500));
 }
 
 }  // namespace internal
 }  // namespace v8