Add a name to the ProcessThread constructor.

Helps differentiate between different instances when debugging.

Review URL: https://codereview.webrtc.org/1337003003

Cr-Commit-Position: refs/heads/master@{#9927}
diff --git a/webrtc/video/call.cc b/webrtc/video/call.cc
index 2df8fe0..ccd2a6a 100644
--- a/webrtc/video/call.cc
+++ b/webrtc/video/call.cc
@@ -136,7 +136,7 @@
 
 Call::Call(const Call::Config& config)
     : num_cpu_cores_(CpuInfo::DetectNumberOfCores()),
-      module_process_thread_(ProcessThread::Create()),
+      module_process_thread_(ProcessThread::Create("ModuleProcessThread")),
       channel_group_(new ChannelGroup(module_process_thread_.get())),
       next_channel_id_(0),
       config_(config),