Histograms - Support histograms for Plugins, GPU

content/common/child_thread.cc

Index: content/common/child_thread.cc
===================================================================
--- content/common/child_thread.cc	(revision 140625)
+++ content/common/child_thread.cc	(working copy)
@@ -10,6 +10,7 @@
 #include "base/process.h"
 #include "base/string_util.h"
 #include "base/tracked_objects.h"
+#include "content/common/child_histogram_message_filter.h"
 #include "content/common/child_process.h"
 #include "content/common/child_process_messages.h"
 #include "content/common/child_trace_message_filter.h"
@@ -59,6 +60,9 @@
 
   sync_message_filter_ =
       new IPC::SyncMessageFilter(ChildProcess::current()->GetShutDownEvent());
+  histogram_message_filter_ = new content::ChildHistogramMessageFilter();
+
+  channel_->AddFilter(histogram_message_filter_.get());

[jar (doing other things), 2012/07/09 23:04:12]

Where is the corresponding code for the profiler?

[ramant (doing other things), 2012/07/11 23:52:54]

ChildThread::OnMessageReceive implemented GetChildProfilerData message.

For histogram_filter, we needed a separate class (ChildHistogramMessageFilter)
because we wanted to derive from  base::HistogramFlattener.

   channel_->AddFilter(sync_message_filter_.get());
   channel_->AddFilter(new ChildTraceMessageFilter());
 }
@@ -68,6 +72,7 @@
   IPC::Logging::GetInstance()->SetIPCSender(NULL);
 #endif
 
+  channel_->RemoveFilter(histogram_message_filter_.get());
   channel_->RemoveFilter(sync_message_filter_.get());
 
   // Close this channel before resetting the message loop attached to it so