Fix Cast dialog not appearing on non-MacViews

Resize the ui::Compositor's size in BrowserCompositorMac's
SynchronizeVisualProperties method.

Re-disable using a unified ui::Compositor (it was accidentally enabled
by a botched merge).

Bug: 840173
Change-Id: I701574e385ae288b991adce81e1ab5efde23e0c2
Reviewed-on: https://chromium-review.googlesource.com/1073682Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562047}

content/browser/renderer_host/browser_compositor_view_mac.mm

@@ -347,6 +347,10 @@ void BrowserCompositorMac::SynchronizeVisualProperties(
                                           new_size_in_pixels);
     dfh_size_pixels_ = new_size_in_pixels;
     root_layer_->SetBounds(gfx::Rect(dfh_size_dip_));
+    if (recyclable_compositor_) {
+      recyclable_compositor_->UpdateSurface(dfh_size_pixels_,
+                                            dfh_display_.device_scale_factor());
+    }
     GetDelegatedFrameHost()->EmbedSurface(
         dfh_local_surface_id_allocator_.GetCurrentLocalSurfaceId(),
         dfh_size_dip_, GetDeadlinePolicy());

content/browser/renderer_host/render_widget_host_view_mac.mm

@@ -146,6 +146,11 @@ RenderWidgetHostViewMac::RenderWidgetHostViewMac(RenderWidgetHost* widget,
                             ui::GestureProviderConfigType::CURRENT_PLATFORM),
                         this),
       weak_factory_(this) {
+  display_only_using_parent_ui_layer_ = !features::IsViewsBrowserCocoa();
+  // TODO(ccameron): This path breaks content_shell because content_shell does
+  // not display using ui::Views, even when !features::IsViewsBrowserCocoa.
+  display_only_using_parent_ui_layer_ = false;
+
   // The NSView is on the other side of |ns_view_bridge_|.
   ns_view_bridge_ = RenderWidgetHostNSViewBridge::Create(this);
 
@@ -204,8 +209,8 @@ RenderWidgetHostViewMac::~RenderWidgetHostViewMac() {
 }
 
 void RenderWidgetHostViewMac::SetParentUiLayer(ui::Layer* parent_ui_layer) {
-  if (parent_ui_layer)
-    display_only_using_parent_ui_layer_ = true;
+  if (!display_only_using_parent_ui_layer_)
+    return;
   if (browser_compositor_)
     browser_compositor_->SetParentUiLayer(parent_ui_layer);
 }