Implement pepper flash fullscreen on Mac

ui/base/cocoa/fullscreen_window_manager.mm

Index: ui/base/cocoa/fullscreen_window_manager.mm
===================================================================
--- ui/base/cocoa/fullscreen_window_manager.mm	(revision 0)
+++ ui/base/cocoa/fullscreen_window_manager.mm	(revision 0)
@@ -0,0 +1,113 @@
+// Copyright (c) 2012 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/base/cocoa/fullscreen_window_manager.h"
+
+namespace {
+
+// Get the screen with the menu bar.
+NSScreen* GetMenuBarScreen() {
+  // Documentation in NSScreen says that the first object in
+  // +[NSScreen screens] is the menu bar screen.
+  NSArray *screens = [NSScreen screens];
+  if ([screens count])
+    return [screens objectAtIndex:0];
+  return nil;
+}
+
+// Get the screen with the dock.
+NSScreen* GetDockScreen() {
+  NSArray *screens = [NSScreen screens];
+  NSUInteger count = [screens count];
+  if (count == 0)
+    return NULL;
+  if (count == 1)
+    return [screens objectAtIndex:0];
+
+  for (NSUInteger i = 1; i < count; ++i) {
+    NSScreen* screen = [screens objectAtIndex:i];
+    // This screen is not the menu bar screen since it's not index 0. Therefore,
+    // the only reason that the frame would not match the visible frame is if
+    // the dock is on the screen.
+    if (!NSEqualRects([screen frame], [screen visibleFrame]))
+      return screen;
+  }
+  return [screens objectAtIndex:0];
+}
+
+}  // namespace
+
+@interface FullscreenWindowManager()
+- (void)onScreenChanged:(NSNotification*)note;
+- (void)update;
+@end
+
+@implementation FullscreenWindowManager
+
+- (id)initWithWindow:(NSWindow*)window
+       desiredScreen:(NSScreen*)desiredScreen {
+  if ((self = [super init])) {
+    window_.reset([window retain]);
+    desiredScreen_.reset([desiredScreen retain]);
+    fullscreenMode_ = base::mac::kFullScreenModeNormal;
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(onScreenChanged:)
+               name:NSApplicationDidChangeScreenParametersNotification
+             object:NSApp];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+  [self exitFullscreenMode];
+  [super dealloc];
+}
+
+- (void)enterFullscreenMode {
+  if (fullscreenActive_)
+    return;
+  fullscreenActive_ = true;
+  [self update];
+}
+
+- (void)exitFullscreenMode {
+  if (!fullscreenActive_)
+    return;
+  fullscreenActive_ = false;
+  [self update];
+}
+
+- (void)onScreenChanged:(NSNotification*)note {
+  [self update];
+}
+
+- (void)update {
+  if (![[NSScreen screens] containsObject:desiredScreen_])
+    desiredScreen_.reset([[window_ screen] retain]);
+
+  base::mac::FullScreenMode newMode;
+  if (!fullscreenActive_)
+    newMode = base::mac::kFullScreenModeNormal;
+  else if (desiredScreen_ == GetMenuBarScreen())
+    newMode = base::mac::kFullScreenModeHideAll;
+  else if (desiredScreen_ == GetDockScreen())
+    newMode = base::mac::kFullScreenModeHideDock;
+  else
+    newMode = base::mac::kFullScreenModeNormal;
+
+  if (fullscreenMode_ != newMode) {
+    if (fullscreenMode_ != base::mac::kFullScreenModeNormal)
+      base::mac::ReleaseFullScreen(fullscreenMode_);
+    if (newMode != base::mac::kFullScreenModeNormal)
+      base::mac::RequestFullScreen(newMode);
+    fullscreenMode_ = newMode;
+  }
+
+  if (fullscreenActive_)
+    [window_ setFrame:[desiredScreen_ frame] display:YES];
+}
+
+@end