Adding WebRTC logging filter, handler and handler host.

content/browser/renderer_host/webrtc_logging_handler_host.cc

+// 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));
+  if (base::SharedMemory::IsHandleValid(shared_memory_.handle()))

[tommi (sloooow) - chröme, 2013/03/28 11:00:10]

{}

Maybe just be a DCHECK for now (until we support multiple OnOpenLog calls if we
need them)?
DCHECK(!base::SharedMemory::IsHandleValid(shared_memory_.handle()));

[Henrik Grunell, 2013/04/02 10:06:40]

Yep, sgtm. The handler in the render process can ensure that we only get here
once. Done.

+    // TODO(grunell): Handle or disallow.
+    NOTIMPLEMENTED();
+
+  if (!shared_memory_.CreateAndMapAnonymous(kWebRtcLogSize)) {
+    LOG(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)) {
+    // TODO(grunell): Handle error. (E.g. close, unmap and send fail msg.)
+    return;
+  }
+
+  Send(new WebRtcLoggingMsg_LogOpened(foreign_memory_handle, kWebRtcLogSize));
+}
+
+}  // namespace content