Plumb ViewportMetrics change notifications around the world and back.

services/view_manager/server_view.cc

Index: services/view_manager/server_view.cc
diff --git a/services/view_manager/server_view.cc b/services/view_manager/server_view.cc
index 17742447952f6a3d0cf54f91904cc8248104c30a..84cd23119e62327a7b5f7cae3a9e66709e5eb1a0 100644
--- a/services/view_manager/server_view.cc
+++ b/services/view_manager/server_view.cc
@@ -11,11 +11,21 @@
 
 namespace view_manager {
 
+namespace {
+
+mojo::ViewportMetricsPtr CreateEmptyViewportMetrics() {
+  mojo::ViewportMetricsPtr metrics = mojo::ViewportMetrics::New();
+  metrics->size = mojo::Size::New();
+  return metrics;
+}
+}
+
 ServerView::ServerView(ServerViewDelegate* delegate, const ViewId& id)
     : delegate_(delegate),
       id_(id),
       parent_(nullptr),
       visible_(false),
+      viewport_metrics_(CreateEmptyViewportMetrics()),
       opacity_(1) {
   DCHECK(delegate);  // Must provide a delegate.
 }
@@ -93,6 +103,16 @@ void ServerView::SetBounds(const gfx::Rect& bounds) {
   delegate_->OnViewBoundsChanged(this, old_bounds, bounds);
 }
 
+void ServerView::SetViewportMetrics(const mojo::ViewportMetrics& metrics) {
+  if (viewport_metrics_->Equals(metrics))
+    return;
+
+  viewport_metrics_ = metrics.Clone();
+  delegate_->OnViewViewportMetricsChanged(this, *viewport_metrics_, metrics);
+  for (size_t i = 0; i < children_.size(); ++i)

[eseidel, 2015/01/27 22:46:58]

Unknown if this is needed or not.

+    children_[i]->SetViewportMetrics(metrics);
+}
+
 const ServerView* ServerView::GetRoot() const {
   const ServerView* view = this;
   while (view && view->parent())