[Extenisons Bindings] Don't throw unchecked errors; add console errors

extensions/renderer/script_context.h

 // 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.
 
 #ifndef EXTENSIONS_RENDERER_SCRIPT_CONTEXT_H_
 #define EXTENSIONS_RENDERER_SCRIPT_CONTEXT_H_
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
+#include "content/public/common/console_message_level.h"
 #include "extensions/common/features/feature.h"
 #include "extensions/common/permissions/api_permission_set.h"
 #include "extensions/renderer/module_system.h"
 #include "extensions/renderer/request_sender.h"
 #include "extensions/renderer/safe_builtins.h"
 #include "extensions/renderer/script_injection_callback.h"
 #include "gin/runner.h"
 #include "url/gurl.h"
 #include "v8/include/v8.h"
 
@@ skipping 178 matching lines @@
   // a context for an extension which has that permission, or by being a web
   // context which has been granted the corresponding capability by an
   // extension.
   bool HasAPIPermission(APIPermission::ID permission) const;
 
   // Throws an Error in this context's JavaScript context, if this context does
   // not have access to |name|. Returns true if this context has access (i.e.
   // no exception thrown), false if it does not (i.e. an exception was thrown).
   bool HasAccessOrThrowError(const std::string& name);
 
+  // Adds a message to the associated RenderFrame's console. If there is no
+  // RenderFrame, LOG()s the message instead.
+  void AddMessageToConsole(content::ConsoleMessageLevel level,
+                           const std::string& message);
+
   // Returns a string representation of this ScriptContext, for debugging.
   std::string GetDebugString() const;
 
   // Gets the current stack trace as a multi-line string to be logged.
   std::string GetStackTraceAsString() const;
 
   // Runs |code|, labelling the script that gets created as |name| (the name is
   // used in the devtools and stack traces). |exception_handler| will be called
   // re-entrantly if an exception is thrown during the script's execution.
   v8::Local<v8::Value> RunScript(
@@ skipping 49 matching lines @@
   std::unique_ptr<Runner> runner_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(ScriptContext);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SCRIPT_CONTEXT_H_