MacViews: Make window content views layer-backed.

ui/views/cocoa/bridged_native_widget.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ui/views/cocoa/bridged_native_widget.h"
 
 #import <objc/runtime.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 528 matching lines @@
   // the old views::View will be gone, so any method calls will become no-ops.
 
   if (view) {
     bridged_view_.reset([[BridgedContentView alloc] initWithView:view]);
     drag_drop_client_.reset(new DragDropClientMac(this, view));
 
     // Objective C initializers can return nil. However, if |view| is non-NULL
     // this should be treated as an error and caught early.
     CHECK(bridged_view_);
   }
+  [bridged_view_ setWantsLayer:YES];
   [window_ setContentView:bridged_view_];
 }
 
 void BridgedNativeWidget::SetVisibilityState(WindowVisibilityState new_state) {
   // Ensure that:
   //  - A window with an invisible parent is not made visible.
   //  - A parent changing visibility updates child window visibility.
   //    * But only when changed via this function - ignore changes via the
   //      NSWindow API, or changes propagating out from here.
   wants_to_be_visible_ = new_state != HIDE_WINDOW;
@@ skipping 701 matching lines @@
   DCHECK(!compositor_);
   DCHECK(!compositor_widget_);
   DCHECK(ViewsDelegate::GetInstance());
 
   ui::ContextFactory* context_factory =
       ViewsDelegate::GetInstance()->GetContextFactory();
   DCHECK(context_factory);
   ui::ContextFactoryPrivate* context_factory_private =
       ViewsDelegate::GetInstance()->GetContextFactoryPrivate();
 
-  AddCompositorSuperview();
+  //AddCompositorSuperview();
+  compositor_superview_.reset([bridged_view_ retain]);
 
   compositor_widget_.reset(new ui::AcceleratedWidgetMac());
   compositor_.reset(new ui::Compositor(context_factory, context_factory_private,
                                        GetCompositorTaskRunner()));
   compositor_->SetAcceleratedWidget(compositor_widget_->accelerated_widget());
   compositor_widget_->SetNSView(this);
 }
 
 void BridgedNativeWidget::InitCompositor() {
   DCHECK(layer());
@@ skipping 144 matching lines @@
   [bridged_view_ setMouseDownCanMoveWindow:draggable];
   // AppKit will not update its cache of mouseDownCanMoveWindow unless something
   // changes. Previously we tried adding an NSView and removing it, but for some
   // reason it required reposting the mouse-down event, and didn't always work.
   // Calling the below seems to be an effective solution.
   [window_ setMovableByWindowBackground:NO];
   [window_ setMovableByWindowBackground:YES];
 }
 
 }  // namespace views