Revert of Mandoline: Remove native_viewport.mojom

components/view_manager/native_viewport/platform_viewport_headless.cc

Index: components/view_manager/native_viewport/platform_viewport_headless.cc
diff --git a/components/view_manager/native_viewport/platform_viewport_headless.cc b/components/view_manager/native_viewport/platform_viewport_headless.cc
index a758a507086cf2d9925cffb180acb38dd8f86e11..3918b18f5dc9ba8e3d54e8496ced5d5659bc9443 100644
--- a/components/view_manager/native_viewport/platform_viewport_headless.cc
+++ b/components/view_manager/native_viewport/platform_viewport_headless.cc
@@ -18,7 +18,7 @@
 void PlatformViewportHeadless::Init(const gfx::Rect& bounds) {
   metrics_ = mojo::ViewportMetrics::New();
   metrics_->device_pixel_ratio = 1.f;
-  metrics_->size_in_pixels = mojo::Size::From(bounds.size());
+  metrics_->size = mojo::Size::From(bounds.size());
 }
 
 void PlatformViewportHeadless::Show() {
@@ -32,11 +32,12 @@
 }
 
 gfx::Size PlatformViewportHeadless::GetSize() {
-  return metrics_->size_in_pixels.To<gfx::Size>();
+  return metrics_->size.To<gfx::Size>();
 }
 
 void PlatformViewportHeadless::SetBounds(const gfx::Rect& bounds) {
-  delegate_->OnMetricsChanged(bounds.size(), 1.f /* device_scale_factor */);
+  metrics_->size = mojo::Size::From(bounds.size());
+  delegate_->OnMetricsChanged(metrics_->Clone());
 }
 
 // static