Conenct Chromoting plugin debug log to JS UI.

remoting/host/plugin/host_plugin_logger.cc

Index: remoting/host/plugin/host_plugin_logger.cc
diff --git a/remoting/host/plugin/host_plugin_logger.cc b/remoting/host/plugin/host_plugin_logger.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c2172f2a434a34115bab341d1689329fab3c1333
--- /dev/null
+++ b/remoting/host/plugin/host_plugin_logger.cc
@@ -0,0 +1,70 @@
+// Copyright (c) 2011 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 "remoting/host/plugin/host_plugin_logger.h"
+
+#include <stdarg.h>  // va_list
+
+#include "base/logging.h"
+#include "base/message_loop.h"
+#include "base/stringprintf.h"
+#include "remoting/host/plugin/host_script_object.h"
+
+namespace remoting {
+
+HostPluginLogger::HostPluginLogger(HostNPScriptObject* scriptable)
+    : scriptable_object_(scriptable),
+      message_loop_(MessageLoop::current()) {
+}
+
+HostPluginLogger::~HostPluginLogger() {
+}
+
+void HostPluginLogger::va_Log(logging::LogSeverity severity,
+                              const char* format, va_list ap) {
+  DCHECK(severity >= 0 && severity <= logging::LOG_NUM_SEVERITIES);
+
+  // Based in LOG_IS_ON macro in base/logging.h.
+  if (severity >= ::logging::GetMinLogLevel()) {
+    std::string message;
+    base::StringAppendV(&message, format, ap);
+
+    // Standard logging.
+    logging::LogMessage(__FILE__, __LINE__, severity).stream() << message;
+
+    // Send log message to the host UI.
+    LogToHostUI(StringPrintf("LOG(%s) %s",
+                             log_severity_names[severity], message.c_str()));
+  }
+
+  va_end(ap);
+}
+
+void HostPluginLogger::va_VLog(int verboselevel,
+                               const char* format,
+                               va_list ap) {
+  if (VLOG_IS_ON(verboselevel)) {
+    std::string message;
+    base::StringAppendV(&message, format, ap);
+
+    // Standard verbose logging.
+    VLOG(verboselevel) << message;
+
+    // Send log message to the host UI.
+    LogToHostUI(StringPrintf("VLOG(%d) %s", verboselevel, message.c_str()));
+  }
+}
+
+void HostPluginLogger::LogToHostUI(const std::string& message) {
+  if (message_loop_ != MessageLoop::current()) {
+    message_loop_->PostTask(
+        FROM_HERE,
+        NewRunnableMethod(this, &HostPluginLogger::LogToHostUI, message));
+    return;
+  }
+
+  scriptable_object_->LogDebugInfo(message);
+}
+
+}  // namespace remoting