Separate module byte size counter for asm.js/wasm.

src/wasm/module-decoder.cc

 // 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.
 
 #include "src/wasm/module-decoder.h"
 #include "src/wasm/function-body-decoder-impl.h"
 
 #include "src/base/functional.h"
 #include "src/base/platform/platform.h"
 #include "src/counters.h"
@@ skipping 1144 matching lines @@
                               const byte* module_end, bool verify_functions,
                               ModuleOrigin origin) {
   HistogramTimerScope wasm_decode_module_time_scope(
       IsWasm(origin) ? isolate->counters()->wasm_decode_wasm_module_time()
                      : isolate->counters()->wasm_decode_asm_module_time());
   size_t size = module_end - module_start;
   if (module_start > module_end) return ModuleError("start > end");
   if (size >= kV8MaxWasmModuleSize)
     return ModuleError("size > maximum module size");
   // TODO(bradnelson): Improve histogram handling of size_t.
-  isolate->counters()->wasm_module_size_bytes()->AddSample(
-      static_cast<int>(size));
+  (IsWasm(origin) ? isolate->counters()->wasm_wasm_module_size_bytes()
+                  : isolate->counters()->wasm_asm_module_size_bytes())
+      ->AddSample(static_cast<int>(size));
   // Signatures are stored in zone memory, which have the same lifetime
   // as the {module}.
   Zone* zone = new Zone(isolate->allocator(), ZONE_NAME);
   ModuleDecoder decoder(zone, module_start, module_end, origin);
   ModuleResult result = decoder.DecodeModule(verify_functions);
   // TODO(bradnelson): Improve histogram handling of size_t.
   // TODO(titzer): this isn't accurate, since it doesn't count the data
   // allocated on the C++ heap.
   // https://bugs.chromium.org/p/chromium/issues/detail?id=657320
   (IsWasm(origin)
@@ skipping 112 matching lines @@
     result.push_back({section_start, name_offset, name_length, payload_offset,
                       payload_length, section_length});
   }
 
   return result;
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8