Report user actions when gesture starts and stops in user_model.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index aa8f002f944a4c82e3ece2712f8fe0f5db2bafba..701631fec4a37f282b7852271d9e0d62723109b0 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -640,6 +640,10 @@ void RenderThreadImpl::Init(
     scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue) {
   TRACE_EVENT0("startup", "RenderThreadImpl::Init");
 
+  action_callback_ = base::Bind(&RenderThreadImpl::RecordComputedAction,
+                                base::Unretained(this));
+  base::AddActionCallback(action_callback_);
+
   base::trace_event::TraceLog::GetInstance()->SetThreadSortIndex(
       base::PlatformThread::CurrentId(),
       kTraceEventRendererMainThreadSortIndex);
@@ -859,6 +863,7 @@ void RenderThreadImpl::Init(
 }
 
 RenderThreadImpl::~RenderThreadImpl() {
+  base::RemoveActionCallback(action_callback_);

[piman, 2016/03/23 19:48:08]

Should this be in Shutdown for consistency?

[beaudoin, 2016/03/29 16:09:39]

Done.

 }
 
 void RenderThreadImpl::Shutdown() {