ozone: demo: Add support for passing fuchsia view owner request

Running on scenic requires passing a
fidl::InterfaceRequest<fuchsia::ui::viewsv1token::ViewOwner> to
CreatePlatformWindow().

Bug: 861853
Test: ozone_demo --ozone-platform=scenic --enable-vulkan (with full series)

Change-Id: I948a4408d64dcb8fef1ec28a55437a48e6ec4a54
Reviewed-on: https://chromium-review.googlesource.com/1188973
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586310}

ui/ozone/demo/BUILD.gn

@@ -37,6 +37,10 @@ source_set("ozone_demo_lib") {
     "//ui/ozone",
     "//ui/platform_window",
   ]
+
+  if (is_fuchsia) {
+    deps += [ "//third_party/fuchsia-sdk:policy" ]
+  }
 }
 
 executable("ozone_demo") {

ui/ozone/demo/demo_window.cc

@@ -14,6 +14,11 @@
 #include "ui/platform_window/platform_window.h"
 #include "ui/platform_window/platform_window_init_properties.h"
 
+#if defined(OS_FUCHSIA)
+#include <fuchsia/ui/policy/cpp/fidl.h>
+#include "base/fuchsia/component_context.h"
+#endif
+
 namespace ui {
 
 DemoWindow::DemoWindow(WindowManager* window_manager,
@@ -24,6 +29,24 @@ DemoWindow::DemoWindow(WindowManager* window_manager,
       weak_ptr_factory_(this) {
   PlatformWindowInitProperties properties;
   properties.bounds = bounds;
+
+#if defined(OS_FUCHSIA)
+  // When using Scenic Ozone platform we need to supply a ViewOwner request to
+  // the window. This is not necessary when using the headless ozone platform.
+  if (ui::OzonePlatform::GetInstance()
+          ->GetPlatformProperties()
+          .needs_view_owner_request) {
+    // Initialize view_owner_request for the new instance.
+    fidl::InterfaceHandle<fuchsia::ui::viewsv1token::ViewOwner> view_owner;
+    properties.view_owner_request = view_owner.NewRequest();
+
+    // Request Presenter to show the view full-screen.
+    auto presenter = base::fuchsia::ComponentContext::GetDefault()
+                         ->ConnectToService<fuchsia::ui::policy::Presenter>();
+    presenter->Present(std::move(view_owner), nullptr);
+  }
+#endif
+
   platform_window_ = OzonePlatform::GetInstance()->CreatePlatformWindow(
       this, std::move(properties));
   platform_window_->Show();

ui/ozone/platform/scenic/scenic_window_canvas.cc

@@ -66,6 +66,7 @@ ScenicWindowCanvas::~ScenicWindowCanvas() {
 
 void ScenicWindowCanvas::ResizeCanvas(const gfx::Size& viewport_size) {
   viewport_size_ = viewport_size;
+  viewport_size_.SetToMax(gfx::Size(1, 1));
 
   ScenicSession* scenic = window_->scenic_session();