[MacViews] Frameless app windows: make content view cover title bar.

chrome/browser/ui/cocoa/apps/native_app_window_cocoa_browsertest.mm

 // Copyright 2013 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.
 
 // This file tests whichever implementation of NativeAppWindow is used.
 // I.e. it could be NativeAppWindowCocoa or ChromeNativeAppWindowViewsMac.
 #include "extensions/browser/app_window/native_app_window.h"
 
 #import <Cocoa/Cocoa.h>
 
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   watcher.reset([[ScopedNotificationWatcher alloc]
       initWithNotification:NSWindowDidExitFullScreenNotification
                  andObject:ns_window]);
   [ns_window toggleFullScreen:nil];
   [watcher waitForNotification];
   EXPECT_EQ(extensions::AppWindow::FULLSCREEN_TYPE_NONE,
             app_window->fullscreen_types_for_test());
   EXPECT_FALSE(window->IsFullscreen());
   EXPECT_FALSE([ns_window styleMask] & NSFullScreenWindowMask);
 }
+
+// Test that, in frameless windows, the web contents has the same size as the
+// window.
+IN_PROC_BROWSER_TEST_F(NativeAppWindowCocoaBrowserTest, Frameless) {
+  extensions::AppWindow* app_window =
+      CreateTestAppWindow("{\"frame\": \"none\"}");
+  NSWindow* ns_window = app_window->GetNativeWindow();
+  NSView* web_contents = app_window->web_contents()->GetNativeView();
+  EXPECT_TRUE(NSEqualSizes(NSMakeSize(512, 384), [web_contents frame].size));
+  // Move and resize the window.
+  NSRect new_frame = NSMakeRect(50, 50, 200, 200);
+  [ns_window setFrame:new_frame display:YES];
+  EXPECT_TRUE(NSEqualSizes(new_frame.size, [web_contents frame].size));
+
+  // Windows created with NSBorderlessWindowMask by default don't have shadow,
+  // but packaged apps should always have one.
+  EXPECT_TRUE([ns_window hasShadow]);
+
+  // Since the window has no constraints, it should have all of the following
+  // style mask bits.
+  NSUInteger style_mask = NSTitledWindowMask | NSClosableWindowMask |
+                          NSMiniaturizableWindowMask | NSResizableWindowMask |
+                          NSTexturedBackgroundWindowMask;
+  EXPECT_EQ(style_mask, [ns_window styleMask]);
+
+  CloseAppWindow(app_window);
+}