Mojo JS bindings: make sure that console.log() could be used in the bindings.

ios/web/webui/mojo_facade.mm

 // Copyright 2016 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.
 
 #import "ios/web/webui/mojo_facade.h"
 
 #import <Foundation/Foundation.h>
 
 #import "base/ios/block_types.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
+#include "base/logging.h"
 #import "base/mac/bind_objc_block.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #import "ios/web/public/web_state/js/crw_js_injection_evaluator.h"
 #include "ios/web/public/web_thread.h"
 #include "mojo/public/cpp/system/core.h"
 #include "services/service_manager/public/interfaces/interface_provider.mojom.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ skipping 41 matching lines @@
   } else if (name == "core.createMessagePipe") {
     result = HandleCoreCreateMessagePipe(args.get());
   } else if (name == "core.writeMessage") {
     result = HandleCoreWriteMessage(args.get());
   } else if (name == "core.readMessage") {
     result = HandleCoreReadMessage(args.get());
   } else if (name == "support.watch") {
     result = HandleSupportWatch(args.get());
   } else if (name == "support.cancelWatch") {
     result = HandleSupportCancelWatch(args.get());
+  } else if (name == "console.log") {
+    result = HandleConsoleLog(args.get());
   }
 
   if (!result) {
     return "";
   }
 
   std::string json_result;
   base::JSONWriter::Write(*result, &json_result);
   return json_result;
 }
@@ skipping 180 matching lines @@
 }
 
 std::unique_ptr<base::Value> MojoFacade::HandleSupportCancelWatch(
     const base::DictionaryValue* args) {
   int watch_id = 0;
   CHECK(args->GetInteger("watchId", &watch_id));
   watchers_.erase(watch_id);
   return nullptr;
 }
 
+std::unique_ptr<base::Value> MojoFacade::HandleConsoleLog(
+    const base::DictionaryValue* args) {
+  std::string message;
+  CHECK(args->GetString("message", &message));
+  LOG(INFO) << message;
+  return nullptr;
+}
+
 }  // namespace web