Track plugin input event latency

ppapi/proxy/ppapi_messages.h

Index: ppapi/proxy/ppapi_messages.h
diff --git a/ppapi/proxy/ppapi_messages.h b/ppapi/proxy/ppapi_messages.h
index 10cde4e4e435f3d66d230ed191ef4354b4f5a3b5..f21ba8b115527f1780d752b7ce4391d7aa43db4c 100644
--- a/ppapi/proxy/ppapi_messages.h
+++ b/ppapi/proxy/ppapi_messages.h
@@ -73,6 +73,11 @@
 #include "ppapi/shared_impl/socket_option_data.h"
 #include "ppapi/shared_impl/url_request_info_data.h"
 #include "ppapi/shared_impl/url_response_info_data.h"
+#include "ui/events/latency_info.h"
+
+#if !defined(OS_NACL)
+#include "content/common/content_param_traits_macros.h"
+#endif
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT PPAPI_PROXY_EXPORT
@@ -121,6 +126,14 @@ IPC_ENUM_TRAITS(PP_VideoDecodeError_Dev)
 IPC_ENUM_TRAITS(PP_VideoDecoder_Profile)
 IPC_ENUM_TRAITS_MAX_VALUE(PP_VideoFrame_Format, PP_VIDEOFRAME_FORMAT_LAST)
 
+// For nacl build, we pull the definition directly from
+// "latency_info_param_traits_macros.h" instead of through
+// "content/common/content_param_traits_macros.h" so we don't have to
+// rely on a nacl content build.
+#if defined(OS_NACL)
+#include "ui/events/latency_info_param_traits_macros.h"
+#endif
+
 IPC_STRUCT_TRAITS_BEGIN(PP_Point)
   IPC_STRUCT_TRAITS_MEMBER(x)
   IPC_STRUCT_TRAITS_MEMBER(y)
@@ -300,6 +313,7 @@ IPC_STRUCT_TRAITS_BEGIN(ppapi::InputEventData)
   IPC_STRUCT_TRAITS_MEMBER(touches)
   IPC_STRUCT_TRAITS_MEMBER(changed_touches)
   IPC_STRUCT_TRAITS_MEMBER(target_touches)
+  IPC_STRUCT_TRAITS_MEMBER(latency_info)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(ppapi::HostPortPair)
@@ -1413,7 +1427,8 @@ IPC_MESSAGE_CONTROL1(PpapiHostMsg_Graphics2D_SetScale,
                      float /* scale */)
 
 // Graphics2D, plugin -> host -> plugin
-IPC_MESSAGE_CONTROL0(PpapiHostMsg_Graphics2D_Flush)
+IPC_MESSAGE_CONTROL1(PpapiHostMsg_Graphics2D_Flush,
+                     std::vector<ui::LatencyInfo> /* latency_info */)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Graphics2D_FlushAck)
 
 IPC_MESSAGE_CONTROL2(PpapiHostMsg_Graphics2D_ReadImageData,