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 6fcaf53b8634588578560097b26321bce06c939b..e194ee42916b2d85da6107329bb062230d2e65d2 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"
@@ -59,6 +60,7 @@ IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params)
 #if defined(OS_MACOSX)
   IPC_STRUCT_MEMBER(gfx::PluginWindowHandle, window)
 #endif
+  IPC_STRUCT_MEMBER(WebKit::WebLatencyInfoImpl, latency_info)
 IPC_STRUCT_END()
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT
@@ -75,6 +77,7 @@ IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params)
 #if defined(OS_MACOSX)
   IPC_STRUCT_MEMBER(gfx::PluginWindowHandle, window)
 #endif
+  IPC_STRUCT_MEMBER(WebKit::WebLatencyInfoImpl, latency_info)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceRelease_Params)
@@ -280,6 +283,12 @@ IPC_MESSAGE_ROUTED2(AcceleratedSurfaceMsg_BufferPresented,
                     uint64 /* surface_handle */,
                     uint32 /* sync_point */)
 
+// 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,
+                    WebKit::WebLatencyInfoImpl /* latency_info */)
+
 // Tells the GPU process to remove all contexts.
 IPC_MESSAGE_CONTROL0(GpuMsg_Clean)
 
@@ -508,6 +517,11 @@ 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,
+                    WebKit::WebLatencyInfoImpl /* 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