Don't throw exceptions when v8 objects/contexts are missing, and catch

chrome/renderer/extensions/console.h

+// Copyright 2013 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 CHROME_RENDERER_EXTENSIONS_CONSOLE_H_
+#define CHROME_RENDERER_EXTENSIONS_CONSOLE_H_
+
+#include <string>
+
+#include "content/public/common/console_message_level.h"
+#include "v8/include/v8.h"
+
+namespace content {
+class RenderView;
+}
+
+namespace extensions {
+
+// Utility for logging messages to RenderViews.
+namespace console {
+
+// Adds |message| to the console of |render_view| at various log levels.
+void Debug(content::RenderView* render_view, const std::string& message);
+void Log(content::RenderView* render_view, const std::string& message);
+void Warn(content::RenderView* render_view, const std::string& message);
+void Error(content::RenderView* render_view, const std::string& message);
+
+void AddMessage(content::RenderView* render_view,
+                content::ConsoleMessageLevel level,
+                const std::string& message);
+
+// Adds |message| to the console that hosts |context|, if any.
+void Debug(v8::Handle<v8::Context> context, const std::string& message);
+void Log(v8::Handle<v8::Context> context, const std::string& message);
+void Warn(v8::Handle<v8::Context> context, const std::string& message);
+void Error(v8::Handle<v8::Context> context, const std::string& message);
+
+void AddMessage(v8::Handle<v8::Context> context,
+                content::ConsoleMessageLevel level,
+                const std::string& message);
+
+}  // namespace console
+
+}  // namespace extensions
+
+#endif  // CHROME_RENDERER_EXTENSIONS_CONSOLE_H_