Add logging to ExtensionsService, UserScriptMaster,

and PluginChannel to be able to see what happens
when chrome runs extensions headless.

It would be better to modify the existing
IPC::Logging mechanism than add logging to
PluginChannel, so that it could be useful for
debugging other types of IPC problems. But I don't
have time to do that right now.

Review URL: http://codereview.chromium.org/28091

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10302 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 16 insertions, 0 deletions

diff --git a/chrome/plugin/plugin_channel.cc b/chrome/plugin/plugin_channel.cc
index ab2d508..d9da495 100644
--- a/chrome/plugin/plugin_channel.cc
+++ b/chrome/plugin/plugin_channel.cc
@@ -7,7 +7,9 @@
 #include "chrome/plugin/plugin_channel.h"
 
 #include "chrome/common/plugin_messages.h"
+#include "base/command_line.h"
 #include "base/string_util.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/plugin/plugin_process.h"
 #include "chrome/plugin/plugin_thread.h"
 
@@ -34,6 +36,8 @@ PluginChannel* PluginChannel::GetPluginChannel(
 PluginChannel::PluginChannel() : in_send_(0) {
   SendUnblockingOnlyDuringDispatch();
   PluginProcess::current()->AddRefProcess();
+  const CommandLine* command_line = CommandLine::ForCurrentProcess();
+  log_messages_ = command_line->HasSwitch(switches::kLogPluginMessages);
 }
 
 PluginChannel::~PluginChannel() {
@@ -42,11 +46,23 @@ PluginChannel::~PluginChannel() {
 
 bool PluginChannel::Send(IPC::Message* msg) {
   in_send_++;
+  if (log_messages_) {
+    LOG(INFO) << "sending message @" << msg << " on channel @" << this
+              << " with type " << msg->type();
+  }
   bool result = PluginChannelBase::Send(msg);
   in_send_--;
   return result;
 }
 
+void PluginChannel::OnMessageReceived(const IPC::Message& msg) {
+  if (log_messages_) {
+    LOG(INFO) << "received message @" << &msg << " on channel @" << this
+              << " with type " << msg.type();
+  }
+  PluginChannelBase::OnMessageReceived(msg);
+}
+
 void PluginChannel::OnControlMessageReceived(const IPC::Message& msg) {
   IPC_BEGIN_MESSAGE_MAP(PluginChannel, msg)
     IPC_MESSAGE_HANDLER(PluginMsg_CreateInstance, OnCreateInstance)