Add latency measurement system

content/common/gpu/gpu_messages.h

Index: content/common/gpu/gpu_messages.h
diff --git a/content/common/gpu/gpu_messages.h b/content/common/gpu/gpu_messages.h
index 00e421dca4f465c77022101692465fcecc7215c6..05929c2e5d7c9e84a8951de52b672530296056f2 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -27,6 +27,7 @@
 #include "ui/gfx/size.h"
 #include "ui/gl/gpu_preference.h"
 #include "ui/surface/transport_dib.h"
+#include "webkit/compositor_bindings/web_latency_info_impl.h"
 
 #if defined(OS_ANDROID)
 #include "content/common/android/surface_texture_peer.h"
@@ -53,6 +54,7 @@ IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params)
 #if defined(OS_MACOSX)
   IPC_STRUCT_MEMBER(gfx::PluginWindowHandle, window)
 #endif
+  IPC_STRUCT_MEMBER(cc::LatencyInfo, latency_info)
 IPC_STRUCT_END()
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT
@@ -70,6 +72,7 @@ IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params)
 #if defined(OS_MACOSX)
   IPC_STRUCT_MEMBER(gfx::PluginWindowHandle, window)
 #endif
+  IPC_STRUCT_MEMBER(cc::LatencyInfo, latency_info)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceRelease_Params)
@@ -279,6 +282,12 @@ IPC_MESSAGE_ROUTED0(AcceleratedSurfaceMsg_ResizeViewACK)
 IPC_MESSAGE_ROUTED1(AcceleratedSurfaceMsg_BufferPresented,
                     AcceleratedSurfaceMsg_BufferPresented_Params)
 
+// Tells the GPU process that the browser process has handled the swap
+// buffers or post sub-buffer request. A non-zero sync point means
+// that we should wait for the sync point.
+IPC_MESSAGE_ROUTED1(AcceleratedSurfaceMsg_FrameDisplayed,
+                    cc::LatencyInfo /* latency_info */)
+
 // Tells the GPU process to remove all contexts.
 IPC_MESSAGE_CONTROL0(GpuMsg_Clean)
 
@@ -496,6 +505,11 @@ IPC_MESSAGE_ROUTED2(GpuCommandBufferMsg_AsyncFlush,
                     int32 /* put_offset */,
                     uint32 /* flush_count */)
 
+// Sends information about the latency of the current frame to or from the GPU
+// process.
+IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SetLatencyInfo,
+                    cc::LatencyInfo /* latency_info */)
+
 // Asynchronously process any commands known to the GPU process. This is only
 // used in the event that a channel is unscheduled and needs to be flushed
 // again to process any commands issued subsequent to unscheduling. The GPU