MacViews: Claim -[NSView isOpaque] for the content view according to the root layer properties.

ui/views/widget/native_widget_mac_unittest.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/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsautorelease_pool.h"
@@ skipping 1361 matching lines @@
   EXPECT_EQ(1, [window invalidateShadowCount]);
 
   test_api.SimulateFrameSwap(gfx::Size(123, 456));
   EXPECT_EQ(2, [window invalidateShadowCount]);
   test_api.SimulateFrameSwap(gfx::Size(123, 456));
   EXPECT_EQ(2, [window invalidateShadowCount]);
 
   widget->CloseNow();
 }
 
+// Test that the contentView opacity corresponds to the window type.
+TEST_F(NativeWidgetMacTest, ContentOpacity) {
+  NativeWidgetMacTestWindow* window;
+  Widget::InitParams init_params =
+      CreateParams(Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+
+  EXPECT_EQ(init_params.opacity, Widget::InitParams::INFER_OPACITY);
+  Widget* widget = CreateWidgetWithTestWindow(init_params, &window);
+
+  // Infer should default to opaque on Mac.
+  EXPECT_TRUE([[window contentView] isOpaque]);
+  widget->CloseNow();
+
+  init_params.opacity = Widget::InitParams::TRANSLUCENT_WINDOW;
+  widget = CreateWidgetWithTestWindow(init_params, &window);
+  EXPECT_FALSE([[window contentView] isOpaque]);
+  widget->CloseNow();
+
+  // Test opaque explicitly.
+  init_params.opacity = Widget::InitParams::OPAQUE_WINDOW;
+  widget = CreateWidgetWithTestWindow(init_params, &window);
+  EXPECT_TRUE([[window contentView] isOpaque]);
+  widget->CloseNow();
+}
+
 // Test the expected result of GetWorkAreaBoundsInScreen().
 TEST_F(NativeWidgetMacTest, GetWorkAreaBoundsInScreen) {
   Widget widget;
   Widget::InitParams params = CreateParams(Widget::InitParams::TYPE_POPUP);
   params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 
   // This is relative to the top-left of the primary screen, so unless the bot's
   // display is smaller than 400x300, the window will be wholly contained there.
   params.bounds = gfx::Rect(100, 100, 300, 200);
   widget.Init(params);
@@ skipping 365 matching lines @@
 
 - (void)dealloc {
   if (deallocFlag_) {
     DCHECK(!*deallocFlag_);
     *deallocFlag_ = true;
   }
   [super dealloc];
 }
 
 @end