Use idle time to make progress on scheduled compilation jobs

src/compiler-dispatcher/compiler-dispatcher-tracer.cc

Index: src/compiler-dispatcher/compiler-dispatcher-tracer.cc
diff --git a/src/compiler-dispatcher/compiler-dispatcher-tracer.cc b/src/compiler-dispatcher/compiler-dispatcher-tracer.cc
index f8af05feb97085a95f3a6267815dff606d3fc28d..17b04b71771f35af10f89dfed467491b73c949bc 100644
--- a/src/compiler-dispatcher/compiler-dispatcher-tracer.cc
+++ b/src/compiler-dispatcher/compiler-dispatcher-tracer.cc
@@ -129,22 +129,23 @@ double CompilerDispatcherTracer::EstimateParseInMs(size_t source_length) const {
   return Estimate(parse_events_, source_length);
 }
 
-double CompilerDispatcherTracer::EstimateFinalizeParsingInMs() {
+double CompilerDispatcherTracer::EstimateFinalizeParsingInMs() const {
   base::LockGuard<base::Mutex> lock(&mutex_);
   return Average(finalize_parsing_events_);
 }
 
-double CompilerDispatcherTracer::EstimatePrepareToCompileInMs() {
+double CompilerDispatcherTracer::EstimatePrepareToCompileInMs() const {
   base::LockGuard<base::Mutex> lock(&mutex_);
   return Average(prepare_compile_events_);
 }
 
-double CompilerDispatcherTracer::EstimateCompileInMs(size_t ast_size_in_bytes) {
+double CompilerDispatcherTracer::EstimateCompileInMs(
+    size_t ast_size_in_bytes) const {
   base::LockGuard<base::Mutex> lock(&mutex_);
   return Estimate(compile_events_, ast_size_in_bytes);
 }
 
-double CompilerDispatcherTracer::EstimateFinalizeCompilingInMs() {
+double CompilerDispatcherTracer::EstimateFinalizeCompilingInMs() const {
   base::LockGuard<base::Mutex> lock(&mutex_);
   return Average(finalize_compiling_events_);
 }