Track plugin input event latency

ppapi/proxy/plugin_globals.cc

Index: ppapi/proxy/plugin_globals.cc
diff --git a/ppapi/proxy/plugin_globals.cc b/ppapi/proxy/plugin_globals.cc
index d361ae1191950b56cf9844ab0aa0983536199bf8..f2c38674c9b84bb293c858e81235bbd070b4c8bc 100644
--- a/ppapi/proxy/plugin_globals.cc
+++ b/ppapi/proxy/plugin_globals.cc
@@ -234,5 +234,36 @@ void PluginGlobals::OnReleaseKeepaliveThrottle() {
   plugin_recently_active_ = false;
 }
 
+void PluginGlobals::AddLatencyInfo(ui::LatencyInfo latency_info,
+                                   PP_Instance instance) {
+  static int64 seq_num = 0;
+  latency_info.AddLatencyNumber(
+      ui::INPUT_EVENT_LATENCY_BEGIN_PLUGIN_COMPONENT, 0, seq_num++);
+  pending_latency_info_[instance].push_back(latency_info);
+}
+
+void PluginGlobals::OnGraphicsInvalidation(PP_Instance instance) {
+  if (pending_latency_info_.find(instance) != pending_latency_info_.end()) {
+    const std::vector<ui::LatencyInfo>& latency
+        = pending_latency_info_[instance];
+    for (size_t i = 0; i < latency.size(); i++)
+      latency_info_for_frame_[instance].push_back(latency[i]);
+    pending_latency_info_.erase(instance);
+  }
+}
+
+void PluginGlobals::OnGraphicsFlush(std::vector<ui::LatencyInfo>* latency_info,
+                                    PP_Instance instance) {
+  latency_info->swap(latency_info_for_frame_[instance]);
+  if (pending_latency_info_.find(instance) != pending_latency_info_.end()) {
+    std::vector<ui::LatencyInfo>& latency = pending_latency_info_[instance];
+    for (size_t i = 0; i < latency.size(); i++) {
+      latency[i].AddLatencyNumber(
+          ui::INPUT_EVENT_LATENCY_TERMINATED_PLUGIN_COMPONENT, 0, 0);
+    }
+    pending_latency_info_.erase(instance);
+  }
+}
+
 }  // namespace proxy
 }  // namespace ppapi