Implement pepper flash fullscreen on Mac

content/shell/shell_mac.mm

Index: content/shell/shell_mac.mm
===================================================================
--- content/shell/shell_mac.mm	(revision 130181)
+++ content/shell/shell_mac.mm	(working copy)
@@ -11,47 +11,13 @@
 #import "base/memory/scoped_nsobject.h"
 #include "base/string_piece.h"
 #include "base/sys_string_conversions.h"
-#import "content/public/browser/accelerated_window_interface.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "content/shell/resource.h"
 #include "googleurl/src/gurl.h"
+#import "ui/base/cocoa/underlay_opengl_hosting_window.h"
 
-@interface ShellWindow : NSWindow<UnderlayableSurface> {
- @private
-  int underlaySurfaceCount_;
-}
-
-// Informs the window that an underlay surface has been added/removed. The
-// window is non-opaque while underlay surfaces are present.
-- (void)underlaySurfaceAdded;
-- (void)underlaySurfaceRemoved;
-
-@end
-
-@implementation ShellWindow
-
-- (void)underlaySurfaceAdded {
-  DCHECK_GE(underlaySurfaceCount_, 0);
-  ++underlaySurfaceCount_;
-
-  // We're having the OpenGL surface render under the window, so the window
-  // needs to be not opaque.
-  if (underlaySurfaceCount_ == 1)
-    [self setOpaque:NO];
-}
-
-- (void)underlaySurfaceRemoved {
-  --underlaySurfaceCount_;
-  DCHECK_GE(underlaySurfaceCount_, 0);
-
-  if (underlaySurfaceCount_ == 0)
-    [self setOpaque:YES];
-}
-
-@end
-
 // Receives notification that the window is closing so that it can start the
 // tear-down process. Is responsible for deleting itself when done.
 @interface ContentShellWindowDelegate : NSObject<NSWindowDelegate> {
@@ -177,14 +143,14 @@
 
 void Shell::PlatformCreateWindow(int width, int height) {
   NSRect initial_window_bounds = NSMakeRect(0, 0, width, height);
-  window_ =
-      [[ShellWindow alloc] initWithContentRect:initial_window_bounds
-                                     styleMask:(NSTitledWindowMask |
-                                                NSClosableWindowMask |
-                                                NSMiniaturizableWindowMask |
-                                                NSResizableWindowMask )
-                                       backing:NSBackingStoreBuffered
-                                         defer:NO];
+  window_ = [[UnderlayOpenGLHostingWindow alloc]
+      initWithContentRect:initial_window_bounds
+                styleMask:(NSTitledWindowMask |
+                           NSClosableWindowMask |
+                           NSMiniaturizableWindowMask |
+                           NSResizableWindowMask )
+                  backing:NSBackingStoreBuffered
+                    defer:NO];
   [window_ setTitle:kWindowTitle];
   NSView* content = [window_ contentView];