Allow multiple logging::LogMessage{Handler,Listener}s

content/gpu/gpu_main.cc

Index: content/gpu/gpu_main.cc
diff --git a/content/gpu/gpu_main.cc b/content/gpu/gpu_main.cc
index 2d6ea76190b1a0e4bb21bfbfecb63ab88d19b193..eb674bbe3e19de089fd66481ba2b821998365c7e 100644
--- a/content/gpu/gpu_main.cc
+++ b/content/gpu/gpu_main.cc
@@ -102,15 +102,24 @@ bool StartSandboxWindows(const sandbox::SandboxInterfaceInfo*);
 base::LazyInstance<GpuChildThread::DeferredMessages> deferred_messages =
     LAZY_INSTANCE_INITIALIZER;
 
-bool GpuProcessLogMessageHandler(int severity,
-                                 const char* file, int line,
-                                 size_t message_start,
-                                 const std::string& str) {
+class GpuMainLogMessageListener : logging::LogMessageListener {
+ public:
+  void OnMessage(int severity,
+                 const char* file,
+                 int line,
+                 size_t message_start,
+                 const std::string& str) override;
+};
+
+void GpuMainLogMessageListener::OnMessage(int severity,
+                                          const char* file,
+                                          int line,
+                                          size_t message_start,
+                                          const std::string& str) {
   std::string header = str.substr(0, message_start);
   std::string message = str.substr(message_start);
   deferred_messages.Get().push(
       new GpuHostMsg_OnLogMessage(severity, header, message));
-  return false;
 }
 
 class ContentSandboxHelper : public gpu::GpuSandboxHelper {
@@ -192,7 +201,7 @@ int GpuMain(const MainFunctionParams& parameters) {
 
 #endif
 
-  logging::SetLogMessageHandler(GpuProcessLogMessageHandler);
+  auto log_listener = base::MakeUnique<GpuMainLogMessageListener>();
 
   // We are experiencing what appear to be memory-stomp issues in the GPU
   // process. These issues seem to be impacting the message loop and listeners
@@ -265,7 +274,7 @@ int GpuMain(const MainFunctionParams& parameters) {
   const bool init_success = gpu_init.InitializeAndStartSandbox(command_line);
   const bool dead_on_arrival = !init_success;
 
-  logging::SetLogMessageHandler(NULL);
+  log_listener.reset();
   GetContentClient()->SetGpuInfo(gpu_init.gpu_info());
 
   std::unique_ptr<gpu::GpuMemoryBufferFactory> gpu_memory_buffer_factory;