Adding WebRTC logging filter, handler and handler host.

content/browser/renderer_host/webrtc_logging_handler_host.cc

Index: content/browser/renderer_host/webrtc_logging_handler_host.cc
diff --git a/content/browser/renderer_host/webrtc_logging_handler_host.cc b/content/browser/renderer_host/webrtc_logging_handler_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4e213c4b61707fe71b06460f74777c0dc97deb72
--- /dev/null
+++ b/content/browser/renderer_host/webrtc_logging_handler_host.cc
@@ -0,0 +1,61 @@
+// Copyright (c) 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.
+
+#include "content/browser/renderer_host/webrtc_logging_handler_host.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "content/common/webrtc_logging_messages.h"
+
+namespace content {
+
+const size_t kWebRtcLogSize = 6 * 1024 * 1024;  // 6 MB
+
+WebRtcLoggingHandlerHost::WebRtcLoggingHandlerHost() {
+}
+
+WebRtcLoggingHandlerHost::~WebRtcLoggingHandlerHost() {
+}
+
+void WebRtcLoggingHandlerHost::OnChannelClosing() {
+  BrowserMessageFilter::OnChannelClosing();
+}
+
+void WebRtcLoggingHandlerHost::OnDestruct() const {
+  BrowserThread::DeleteOnIOThread::Destruct(this);
+}
+
+bool WebRtcLoggingHandlerHost::OnMessageReceived(const IPC::Message& message,
+                                                 bool* message_was_ok) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(WebRtcLoggingHandlerHost, message, *message_was_ok)
+    IPC_MESSAGE_HANDLER(WebRtcLoggingMsg_OpenLog, OnOpenLog)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP_EX()
+
+  return handled;
+}
+
+void WebRtcLoggingHandlerHost::OnOpenLog() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK(!base::SharedMemory::IsHandleValid(shared_memory_.handle()));
+
+  if (!shared_memory_.CreateAndMapAnonymous(kWebRtcLogSize)) {
+    DLOG(ERROR) << "Failed to create shared memory.";
+    Send(new WebRtcLoggingMsg_OpenLogFailed());
+    return;
+  }
+
+  base::SharedMemoryHandle foreign_memory_handle;
+  if (!shared_memory_.ShareToProcess(peer_handle(),
+                                     &foreign_memory_handle)) {
+    Send(new WebRtcLoggingMsg_OpenLogFailed());
+    return;
+  }
+
+  Send(new WebRtcLoggingMsg_LogOpened(foreign_memory_handle, kWebRtcLogSize));
+}
+
+}  // namespace content