Plumb cc::LatencyInfo through command buffer and output surface

cc/output/output_surface.cc

Index: cc/output/output_surface.cc
diff --git a/cc/output/output_surface.cc b/cc/output/output_surface.cc
index 534b46dbfc5fff8f77d817143dd3f97b540cfbf0..416440283d4bdfca847494ea0ca9e5c3b6f6d44d 100644
--- a/cc/output/output_surface.cc
+++ b/cc/output/output_surface.cc
@@ -95,14 +95,15 @@ void OutputSurface::BindFramebuffer() {
   context3d_->bindFramebuffer(GL_FRAMEBUFFER, 0);
 }
 
-void OutputSurface::SwapBuffers() {
+void OutputSurface::SwapBuffers(const LatencyInfo& latency_info) {
   DCHECK(context3d_);
   // Note that currently this has the same effect as SwapBuffers; we should
   // consider exposing a different entry point on WebGraphicsContext3D.
   context3d_->prepareTexture();
 }
 
-void OutputSurface::PostSubBuffer(gfx::Rect rect) {
+void OutputSurface::PostSubBuffer(gfx::Rect rect,
+                                  const LatencyInfo& latency_info) {
   DCHECK(context3d_);
   context3d_->postSubBufferCHROMIUM(
       rect.x(), rect.y(), rect.width(), rect.height());