Plumb cc::LatencyInfo through command buffer and output surface

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 9aecf1a86d7fd239c7744b2f58095cf5aa5141dd..9344157c0f9759f4423dccb41715390b180fd1bb 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/shared_memory.h"
+#include "cc/debug/latency_info.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/gpu_memory_allocation.h"
 #include "content/common/gpu/gpu_memory_uma_stats.h"
@@ -50,6 +51,7 @@ IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params)
   IPC_STRUCT_MEMBER(int32, route_id)
   IPC_STRUCT_MEMBER(std::string, mailbox_name)
   IPC_STRUCT_MEMBER(gfx::Size, size)
+  IPC_STRUCT_MEMBER(cc::LatencyInfo, latency_info)
 IPC_STRUCT_END()
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT
@@ -64,6 +66,7 @@ IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params)
   IPC_STRUCT_MEMBER(int, height)
   IPC_STRUCT_MEMBER(std::string, mailbox_name)
   IPC_STRUCT_MEMBER(gfx::Size, surface_size)
+  IPC_STRUCT_MEMBER(cc::LatencyInfo, latency_info)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceRelease_Params)
@@ -361,6 +364,11 @@ IPC_MESSAGE_CONTROL3(GpuHostMsg_ResizeView,
                      int32 /* route_id */,
                      gfx::Size /* size */)
 
+// Tells the browser that a frame with the specific latency info was drawn to
+// the screen
+IPC_MESSAGE_CONTROL1(GpuHostMsg_FrameDrawn,
+                     cc::LatencyInfo /* latency_info */)
+
 // Same as above with a rect of the part of the surface that changed.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_AcceleratedSurfaceBuffersSwapped,
                      GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params)
@@ -502,6 +510,11 @@ IPC_MESSAGE_ROUTED2(GpuCommandBufferMsg_AsyncFlush,
                     int32 /* put_offset */,
                     uint32 /* flush_count */)
 
+// Sends information about the latency of the current frame to 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