Support plumbing LatencyInfo through the old software path.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 0a6ea3e39b8f6cba2e9ec0626b01fb4dd1b9ad28..12040d1396bc47c54012713c1d2984f2d75ae23c 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -724,9 +724,12 @@ void RenderWidgetHostViewMac::ImeCompositionRangeChanged(
 void RenderWidgetHostViewMac::DidUpdateBackingStore(
     const gfx::Rect& scroll_rect,
     const gfx::Vector2d& scroll_delta,
-    const std::vector<gfx::Rect>& copy_rects) {
+    const std::vector<gfx::Rect>& copy_rects,
+    const ui::LatencyInfo& latency_info) {
   GotSoftwareFrame();
 
+  software_latency_info_.MergeWith(latency_info);
+
   if (!is_hidden_) {
     std::vector<gfx::Rect> rects(copy_rects);
 
@@ -1593,6 +1596,12 @@ gfx::Rect RenderWidgetHostViewMac::GetScaledOpenGLPixelRect(
                                              ScaleFactor(cocoa_view_)));
 }
 
+void RenderWidgetHostViewMac::FrameSwapped() {
+  software_latency_info_.swap_timestamp = base::TimeTicks::HighResNow();
+  render_widget_host_->FrameSwapped(software_latency_info_);
+  software_latency_info_.Clear();
+}
+
 }  // namespace content
 
 // RenderWidgetHostViewCocoa ---------------------------------------------------
@@ -2384,6 +2393,8 @@ gfx::Rect RenderWidgetHostViewMac::GetScaledOpenGLPixelRect(
       }
     }
 
+    renderWidgetHostView_->FrameSwapped();
+
     // Fill the remaining portion of the damagedRect with white
     [self fillBottomRightRemainderOfRect:bitmapRect dirtyRect:damagedRect];