Add latency measurement system

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index d1e322e9efe091d535b7f2d441d15a7222c48879..aa47c3c6c85e4ce228c2e5a27a426ee0231664e3 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -49,6 +49,7 @@
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 #include "ui/gfx/vector2d.h"
+#include "webkit/compositor_bindings/web_latency_info_impl.h"
 #include "webkit/glue/webcookie.h"
 #include "webkit/glue/webmenuitem.h"
 #include "webkit/glue/webpreferences.h"
@@ -396,6 +397,15 @@ IPC_STRUCT_TRAITS_BEGIN(ui::SelectedFileInfo)
   IPC_STRUCT_TRAITS_MEMBER(display_name)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(WebKit::WebLatencyInfoImpl)
+  IPC_STRUCT_TRAITS_MEMBER(inputNumber)
+  IPC_STRUCT_TRAITS_MEMBER(rendererMainFrameNumber)
+  IPC_STRUCT_TRAITS_MEMBER(rendererImplFrameNumber)
+  IPC_STRUCT_TRAITS_MEMBER(browserMainFrameNumber)
+  IPC_STRUCT_TRAITS_MEMBER(browserImplFrameNumber)
+  IPC_STRUCT_TRAITS_MEMBER(swapTimestamp)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_BEGIN(ViewHostMsg_CreateWindow_Params)
   // Routing ID of the view initiating the open.
   IPC_STRUCT_MEMBER(int, opener_id)
@@ -614,6 +624,9 @@ IPC_STRUCT_BEGIN(ViewHostMsg_UpdateRect_Params)
   // All the above coordinates are in DIP. This is the scale factor needed
   // to convert them to pixels.
   IPC_STRUCT_MEMBER(float, scale_factor)
+
+  // The frame number this update rect corresponds to.
+  IPC_STRUCT_MEMBER(WebKit::WebLatencyInfoImpl, latency_info)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(ViewMsg_PostMessage_Params)
@@ -925,10 +938,15 @@ IPC_MESSAGE_ROUTED0(ViewMsg_UpdateRect_ACK)
 IPC_MESSAGE_ROUTED0(ViewMsg_SwapBuffers_ACK)
 
 // Sends an input event to the render widget.
-IPC_MESSAGE_ROUTED2(ViewMsg_HandleInputEvent,
+IPC_MESSAGE_ROUTED3(ViewMsg_HandleInputEvent,
+                    int64 /* input_number */,
                     IPC::WebInputEventPointer /* event */,
                     bool /* is_keyboard_shortcut */)
 
+// A new frame with a new input number has started.
+IPC_MESSAGE_ROUTED1(ViewMsg_StartFrame,
+                    int64 /* input_number */)
+
 // Tells the render widget that a smooth scroll completed.
 IPC_MESSAGE_ROUTED1(ViewMsg_SmoothScrollCompleted,
                     int /* gesture_id */)