Remove GpuHostMsg_FrameDrawn and replace with client channel swap ack

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 4375debb68194c51cec3ff9cf04ce6e5f4207411..653c4947c64fa7ea7b922005d5fb570eadabb808 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -370,11 +370,6 @@ IPC_MESSAGE_CONTROL2(GpuHostMsg_AcceleratedSurfaceInitialized,
                      int32 /* surface_id */,
                      int32 /* route_id */)
 
-// Tells the browser that a frame with the specific latency info was drawn to
-// the screen
-IPC_MESSAGE_CONTROL1(GpuHostMsg_FrameDrawn,
-                     std::vector<ui::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)
@@ -540,6 +535,10 @@ IPC_SYNC_MESSAGE_ROUTED5_1(GpuCommandBufferMsg_CreateVideoEncoder,
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_Destroyed,
                     gpu::error::ContextLostReason /* reason */)
 
+// Tells the browser that SwapBuffers returned and passes latency info
+IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SwapBuffersCompleted,
+                    std::vector<ui::LatencyInfo> /* latency_info */)
+
 // Send to stub on surface visibility change.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SetSurfaceVisible, bool /* visible */)