Collect tab timing information for use in telementry-based startup tests

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index a1ccbf6dc3838771d6937e222359091f6caad7c8..f9f27c65f57d89818baec4bbf779697d57265599 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -87,6 +87,7 @@
 #include "content/browser/resolve_proxy_msg_helper.h"
 #include "content/browser/speech/input_tag_speech_dispatcher_host.h"
 #include "content/browser/speech/speech_recognition_dispatcher_host.h"
+#include "content/browser/stats_collection_message_filter.h"
 #include "content/browser/storage_partition_impl.h"
 #include "content/browser/tracing/trace_message_filter.h"
 #include "content/browser/webui/web_ui_controller_factory_registry.h"
@@ -670,6 +671,11 @@ void RenderProcessHostImpl::CreateMessageFilters() {
   channel_->AddFilter(new ProfilerMessageFilter(PROCESS_TYPE_RENDERER));
   channel_->AddFilter(new HistogramMessageFilter());
   channel_->AddFilter(new HyphenatorMessageFilter(this));
+
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kStatsCollectionExtension)) {
+    channel_->AddFilter(new StatsCollectionMessageFilter());
+  }
 }
 
 int RenderProcessHostImpl::GetNextRoutingID() {
@@ -813,6 +819,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
 #endif
     switches::kDisableWebSockets,
     switches::kDomAutomationController,
+    switches::kStatsCollectionExtension,
     switches::kEnableAccessibilityLogging,
     switches::kEnableBrowserPluginForAllViewTypes,
     switches::kEnableDCHECK,