[Extensions Bindings] Fix getPlatform() method

extensions/renderer/process_info_native_handler.cc

 // Copyright 2014 The Chromium 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 "extensions/renderer/process_info_native_handler.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "extensions/renderer/bindings/api_binding_util.h"
 #include "extensions/renderer/script_context.h"
+#include "gin/converter.h"
 
 namespace extensions {
 
 ProcessInfoNativeHandler::ProcessInfoNativeHandler(
     ScriptContext* context,
     const std::string& extension_id,
     const std::string& context_type,
     bool is_incognito_context,
     bool is_component_extension,
     int manifest_version,
@@ skipping 19 matching lines @@
                            base::Unretained(this)));
   RouteFunction("GetManifestVersion",
                 base::Bind(&ProcessInfoNativeHandler::GetManifestVersion,
                            base::Unretained(this)));
   RouteFunction("IsSendRequestDisabled",
                 base::Bind(&ProcessInfoNativeHandler::IsSendRequestDisabled,
                            base::Unretained(this)));
   RouteFunction(
       "HasSwitch",
       base::Bind(&ProcessInfoNativeHandler::HasSwitch, base::Unretained(this)));
+  RouteFunction("GetPlatform",
+                base::Bind(&ProcessInfoNativeHandler::GetPlatform,
+                           base::Unretained(this)));
 }
 
 void ProcessInfoNativeHandler::GetExtensionId(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   args.GetReturnValue().Set(
       v8::String::NewFromUtf8(args.GetIsolate(), extension_id_.c_str()));
 }
 
 void ProcessInfoNativeHandler::GetContextType(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
@@ skipping 27 matching lines @@
 }
 
 void ProcessInfoNativeHandler::HasSwitch(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK(args.Length() == 1 && args[0]->IsString());
   bool has_switch = base::CommandLine::ForCurrentProcess()->HasSwitch(
       *v8::String::Utf8Value(args[0]));
   args.GetReturnValue().Set(v8::Boolean::New(args.GetIsolate(), has_switch));
 }
 
+void ProcessInfoNativeHandler::GetPlatform(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  CHECK_EQ(0, args.Length());
+  args.GetReturnValue().Set(
+      gin::StringToSymbol(args.GetIsolate(), binding::GetPlatformString()));
+}
+
 }  // namespace extensions