[bindings] Implment postMessageImpl and replace the usage of postMessageMethodCommon.

Source/bindings/templates/methods.cpp

 {% from 'conversions.cpp' import declare_enum_validation_variable, v8_value_to_local_cpp_value %}
 
 
 {##############################################################################}
 {% macro generate_method(method, world_suffix) %}
 {% filter conditional(method.conditional_string) %}
 {% if method.returns_promise and method.has_exception_state %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}Promise(const v8::FunctionCallbackInfo<v8::Value>& info, ExceptionState& exceptionState)
 {% else %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const v8::FunctionCallbackInfo<v8::Value>& info)
@@ skipping 426 matching lines @@
     {% endif %}
     {# No match, throw error #}
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     {{propagate_error_with_exception_state(overloads) | indent}}
     {% endif %}
 }
 {% endmacro %}
 
 
 {##############################################################################}
+{% macro generate_post_message_impl() %}
+void postMessageImpl(const char* interfaceName, {{cpp_class}}* instance, const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    ExceptionState exceptionState(ExceptionState::ExecutionContext, "postMessage", interfaceName, info.Holder(), info.GetIsolate());
+    if (UNLIKELY(info.Length() < 1)) {
+        setMinimumArityTypeError(exceptionState, 1, info.Length());
+        exceptionState.throwIfNeeded();
+        return;
+    }
+    OwnPtrWillBeRawPtr<MessagePortArray> ports = adoptPtrWillBeNoop(new MessagePortArray);
+    ArrayBufferArray arrayBuffers;
+    if (info.Length() > 1) {
+        const int transferablesArgIndex = 1;
+        if (!SerializedScriptValue::extractTransferables(info.GetIsolate(), info[transferablesArgIndex], transferablesArgIndex, *ports, arrayBuffers, exceptionState)) {
+            exceptionState.throwIfNeeded();
+            return;
+        }
+    }
+    RefPtr<SerializedScriptValue> message = SerializedScriptValueFactory::instance().create(info.GetIsolate(), info[0], ports.get(), &arrayBuffers, exceptionState);
+    if (exceptionState.throwIfNeeded())
+        return;
+    // FIXME: Only pass context/exceptionState if instance really requires it.
+    ExecutionContext* context = currentExecutionContext(info.GetIsolate());
+    instance->postMessage(context, message.release(), ports.get(), exceptionState);
+    exceptionState.throwIfNeeded();
+}
+{% endmacro %}
+
+{##############################################################################}
 {% macro method_callback(method, world_suffix) %}
 {% filter conditional(method.conditional_string) %}
 static void {{method.name}}MethodCallback{{world_suffix}}(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     {% if not method.overloads %}{# Overloaded methods are measured in overload_resolution_method() #}
     {% if method.measure_as %}
     UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::{{method.measure_as('Method')}});
     {% endif %}
     {% if method.deprecate_as %}
     UseCounter::countDeprecationIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()), UseCounter::{{method.deprecate_as}});
     {% endif %}
     {% endif %}{# not method.overloads #}
     {% if world_suffix in method.activity_logging_world_list %}
     ScriptState* scriptState = ScriptState::from(info.GetIsolate()->GetCurrentContext());
     V8PerContextData* contextData = scriptState->perContextData();
     {% if method.activity_logging_world_check %}
     if (scriptState->world().isIsolatedWorld() && contextData && contextData->activityLogger())
     {% else %}
     if (contextData && contextData->activityLogger()) {
     {% endif %}
         ExceptionState exceptionState(ExceptionState::ExecutionContext, "{{method.name}}", "{{interface_name}}", info.Holder(), info.GetIsolate());
         Vector<v8::Local<v8::Value>> loggerArgs = toImplArguments<v8::Local<v8::Value>>(info, 0, exceptionState);
         contextData->activityLogger()->logMethod("{{interface_name}}.{{method.name}}", info.Length(), loggerArgs.data());
     }
     {% endif %}
     {% if method.is_custom %}
     {{v8_class}}::{{method.name}}MethodCustom(info);
     {% elif method.is_post_message %}
-    postMessageMethodCommon("{{interface_name}}", {{v8_class}}::toImpl(info.Holder()), info);
+    postMessageImpl("{{interface_name}}", {{v8_class}}::toImpl(info.Holder()), info);
     {% else %}
     {{cpp_class_or_partial}}V8Internal::{{method.name}}Method{{world_suffix}}(info);
     {% endif %}
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 {% endfilter %}
 {% endmacro %}
 
 
 {##############################################################################}
@@ skipping 175 matching lines @@
                           if method.overloads else
                           method.runtime_enabled_function) %}
 v8::Local<v8::FunctionTemplate> functionTemplate = v8::FunctionTemplate::New(isolate, {{cpp_class_or_partial}}V8Internal::{{method.name}}MethodCallback, v8Undefined(), defaultSignature, {{method.number_of_required_arguments}});
 v8::Local<v8::Function> function = ->GetFunction(isolate->GetCurrentContext())).ToLocalChecked();
 v8CallOrCrash(prototypeObject->Set(isolate->GetCurrentContext(), v8AtomicString(isolate, "{{method.name}}"), function));
 {% endfilter %}{# runtime_enabled() #}
 {% endfilter %}{# exposed() #}
 {% endfor %}
 {% endif %}
 {%- endmacro %}