Only turn on UMA WASM metric when synchronous.

src/wasm/module-decoder.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_WASM_MODULE_DECODER_H_
 #define V8_WASM_MODULE_DECODER_H_
 
 #include "src/globals.h"
 #include "src/wasm/function-body-decoder.h"
 #include "src/wasm/wasm-module.h"
@@ skipping 39 matching lines @@
 typedef Result<FunctionOffsets> FunctionOffsetsResult;
 struct AsmJsOffsetEntry {
   int byte_offset;
   int source_position_call;
   int source_position_number_conversion;
 };
 typedef std::vector<std::vector<AsmJsOffsetEntry>> AsmJsOffsets;
 typedef Result<AsmJsOffsets> AsmJsOffsetsResult;
 
 // Decodes the bytes of a WASM module between {module_start} and {module_end}.
-V8_EXPORT_PRIVATE ModuleResult DecodeWasmModule(Isolate* isolate,
-                                                const byte* module_start,
-                                                const byte* module_end,
-                                                bool verify_functions,
-                                                ModuleOrigin origin);
+V8_EXPORT_PRIVATE ModuleResult DecodeWasmModule(
+    Isolate* isolate, const byte* module_start, const byte* module_end,
+    bool verify_functions, ModuleOrigin origin, bool is_sync = true);
 
 // Exposed for testing. Decodes a single function signature, allocating it
 // in the given zone. Returns {nullptr} upon failure.
 V8_EXPORT_PRIVATE FunctionSig* DecodeWasmSignatureForTesting(Zone* zone,
                                                              const byte* start,
                                                              const byte* end);
 
 // Decodes the bytes of a WASM function between
 // {function_start} and {function_end}.
-V8_EXPORT_PRIVATE FunctionResult DecodeWasmFunction(Isolate* isolate,
-                                                    Zone* zone,
-                                                    ModuleBytesEnv* env,
-                                                    const byte* function_start,
-                                                    const byte* function_end);
+V8_EXPORT_PRIVATE FunctionResult DecodeWasmFunction(
+    Isolate* isolate, Zone* zone, ModuleBytesEnv* env,
+    const byte* function_start, const byte* function_end, bool is_sync = true);
 
 V8_EXPORT_PRIVATE WasmInitExpr DecodeWasmInitExprForTesting(const byte* start,
                                                             const byte* end);
 
 struct CustomSectionOffset {
   uint32_t section_start;
   uint32_t name_offset;
   uint32_t name_length;
   uint32_t payload_offset;
   uint32_t payload_length;
   uint32_t section_length;
 };
 
 V8_EXPORT_PRIVATE std::vector<CustomSectionOffset> DecodeCustomSections(
     const byte* start, const byte* end);
 
 // Extracts the mapping from wasm byte offset to asm.js source position per
 // function.
 // Returns a vector of vectors with <byte_offset, source_position> entries, or
 // failure if the wasm bytes are detected as invalid. Note that this validation
 // is not complete.
 AsmJsOffsetsResult DecodeAsmJsOffsets(const byte* module_start,
                                       const byte* module_end);
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_DECODER_H_