Histograms - Support histograms for Plugins, GPU

content/common/child_thread.cc

Index: content/common/child_thread.cc
===================================================================
--- content/common/child_thread.cc	(revision 146279)
+++ 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"
@@ -60,6 +61,9 @@
 
   sync_message_filter_ =
       new IPC::SyncMessageFilter(ChildProcess::current()->GetShutDownEvent());
+  histogram_message_filter_ = new content::ChildHistogramMessageFilter();
+
+  channel_->AddFilter(histogram_message_filter_.get());
   channel_->AddFilter(sync_message_filter_.get());
   channel_->AddFilter(new ChildTraceMessageFilter());
 }
@@ -69,6 +73,7 @@
   IPC::Logging::GetInstance()->SetIPCSender(NULL);
 #endif
 
+  channel_->RemoveFilter(histogram_message_filter_.get());
   channel_->RemoveFilter(sync_message_filter_.get());
 
   // The ChannelProxy object caches a pointer to the IPC thread, so need to