Fix use of history timers in background threads.

src/compiler/wasm-compiler.h

 // Copyright 2015 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.
 
 #ifndef V8_COMPILER_WASM_COMPILER_H_
 #define V8_COMPILER_WASM_COMPILER_H_
 
 #include <memory>
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
@@ skipping 30 matching lines @@
 
 // Expose {Node} and {Graph} opaquely as {wasm::TFNode} and {wasm::TFGraph}.
 typedef compiler::Node TFNode;
 typedef compiler::JSGraph TFGraph;
 }  // namespace wasm
 
 namespace compiler {
 class WasmCompilationUnit final {
  public:
   WasmCompilationUnit(Isolate* isolate, wasm::ModuleBytesEnv* module_env,
-                      const wasm::WasmFunction* function, bool is_sync = true);
+                      const wasm::WasmFunction* function);
   WasmCompilationUnit(Isolate* isolate, wasm::ModuleEnv* module_env,
-                      wasm::FunctionBody body, wasm::WasmName name, int index,
-                      bool is_sync = true);
+                      wasm::FunctionBody body, wasm::WasmName name, int index);
 
   int func_index() const { return func_index_; }
 
   void ReopenCentryStub() { centry_stub_ = handle(*centry_stub_, isolate_); }
   void ExecuteCompilation();
   Handle<Code> FinishCompilation(wasm::ErrorThrower* thrower);
 
   static Handle<Code> CompileWasmFunction(wasm::ErrorThrower* thrower,
                                           Isolate* isolate,
                                           wasm::ModuleBytesEnv* module_env,
                                           const wasm::WasmFunction* function);
 
   void set_memory_cost(size_t memory_cost) { memory_cost_ = memory_cost; }
   size_t memory_cost() const { return memory_cost_; }
 
  private:
   SourcePositionTable* BuildGraphForWasmFunction(double* decode_ms);
 
   Isolate* isolate_;
   wasm::ModuleEnv* module_env_;
   wasm::FunctionBody func_body_;
   wasm::WasmName func_name_;
-  bool is_sync_;
   // The graph zone is deallocated at the end of ExecuteCompilation by virtue of
   // it being zone allocated.
   JSGraph* jsgraph_ = nullptr;
   // the compilation_zone_, info_, and job_ fields need to survive past
   // ExecuteCompilation, onto FinishCompilation (which happens on the main
   // thread).
   std::unique_ptr<Zone> compilation_zone_;
   std::unique_ptr<CompilationInfo> info_;
   std::unique_ptr<CompilationJob> job_;
   Handle<Code> centry_stub_;
@@ skipping 323 matching lines @@
                         wasm::FunctionSig* sig);
 
   void SetNeedsStackCheck() { needs_stack_check_ = true; }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_WASM_COMPILER_H_