Add latency measurement system

content/common/gpu/texture_image_transport_surface.cc

Index: content/common/gpu/texture_image_transport_surface.cc
diff --git a/content/common/gpu/texture_image_transport_surface.cc b/content/common/gpu/texture_image_transport_surface.cc
index d354bef215388de84b5c060a7ded228bdfd5b2fb..bd3b5033bfb61555dca432a32330f71872d7784a 100644
--- a/content/common/gpu/texture_image_transport_surface.cc
+++ b/content/common/gpu/texture_image_transport_surface.cc
@@ -205,8 +205,25 @@ void TextureImageTransportSurface::OnWillDestroyStub(
   stub_destroyed_ = true;
 }
 
+void TextureImageTransportSurface::SetLatencyInfo(
+    const WebKit::WebLatencyInfoImpl& latency_info) {
+  if (latency_info_.rendererImplFrameNumber !=
+      latency_info.rendererImplFrameNumber) {
+    TRACE_EVENT_ASYNC_BEGIN2("frame", "Renderer Frame", this,
+                             "frame_number",
+                                 latency_info.rendererImplFrameNumber,
+                                 "input_number", latency_info.inputNumber);
+  }
+
+  latency_info_ = latency_info;
+}
+
 bool TextureImageTransportSurface::SwapBuffers() {
   DCHECK(backbuffer_suggested_allocation_);
+  TRACE_EVENT_ASYNC_END2("frame", "Renderer Frame", this,
+                         "frame_number", latency_info_.rendererImplFrameNumber,
+                         "input_number", latency_info_.inputNumber);
+
   if (!frontbuffer_suggested_allocation_)
     return true;
 
@@ -221,6 +238,7 @@ bool TextureImageTransportSurface::SwapBuffers() {
   GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params params;
   params.surface_handle = backbuffer_.surface_handle;
   params.size = backbuffer_.size;
+  params.latency_info = latency_info_;
   helper_->SendAcceleratedSurfaceBuffersSwapped(params);
 
   DCHECK(!is_swap_buffers_pending_);
@@ -231,6 +249,9 @@ bool TextureImageTransportSurface::SwapBuffers() {
 bool TextureImageTransportSurface::PostSubBuffer(
     int x, int y, int width, int height) {
   DCHECK(backbuffer_suggested_allocation_);
+  TRACE_EVENT_ASYNC_END2("frame", "Renderer Frame", this,
+                         "frame_number", latency_info_.rendererImplFrameNumber,
+                         "input_number", latency_info_.inputNumber);
   if (!frontbuffer_suggested_allocation_)
     return true;
   const gfx::Rect new_damage_rect(x, y, width, height);
@@ -256,6 +277,7 @@ bool TextureImageTransportSurface::PostSubBuffer(
   params.y = y;
   params.width = width;
   params.height = height;
+  params.latency_info = latency_info_;
   helper_->SendAcceleratedSurfacePostSubBuffer(params);
 
   DCHECK(!is_swap_buffers_pending_);