mac: Implement custom AppKit Enter Fullscreen transition.

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 36a9ccd5d0fde2f556e7de584b576f03888fcd0c..55524f1b6296f50cfb2e76e24177da06b8e4fca8 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -22,6 +22,7 @@
 #include "chrome/browser/ui/bookmarks/bookmark_tab_helper.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window_state.h"
+#import "chrome/browser/ui/cocoa/browser_window_enter_fullscreen_transition.h"
 #import "chrome/browser/ui/cocoa/browser_window_layout.h"
 #import "chrome/browser/ui/cocoa/dev_tools_controller.h"
 #import "chrome/browser/ui/cocoa/fast_resize_view.h"
@@ -682,6 +683,8 @@ willPositionSheet:(NSWindow*)sheet
 }
 
 - (void)windowDidEnterFullScreen:(NSNotification*)notification {
+  enterFullscreenTransition_.reset();
+
   // In Yosemite, some combination of the titlebar and toolbar always show in
   // full-screen mode. We do not want either to show. Search for the window that
   // contains the views, and hide it. There is no need to ever unhide the view.
@@ -1017,4 +1020,37 @@ willPositionSheet:(NSWindow*)sheet
   return YES;
 }
 
+- (BOOL)shouldUseCustomAppKitFullscreenTransition {
+  if (base::mac::IsOSMountainLionOrEarlier())
+    return NO;
+  NSView* root = [[self.window contentView] superview];
+  return root.layer != nil;
+}
+
+- (NSArray*)customWindowsToEnterFullScreenForWindow:(NSWindow*)window {
+  DCHECK([window isEqual:self.window]);
+
+  if (![self shouldUseCustomAppKitFullscreenTransition])
+    return nil;
+
+  enterFullscreenTransition_.reset(
+      [[BrowserWindowEnterFullscreenTransition alloc]
+          initWithWindow:self.window]);
+  return [enterFullscreenTransition_ customWindowsToEnterFullScreen];
+}
+
+- (void)window:(NSWindow*)window
+    startCustomAnimationToEnterFullScreenWithDuration:(NSTimeInterval)duration {
+  DCHECK([window isEqual:self.window]);
+  [enterFullscreenTransition_
+      startCustomAnimationToEnterFullScreenWithDuration:duration];
+}
+
+- (BOOL)shouldConstrainFrameRect {
+  if ([enterFullscreenTransition_ shouldWindowBeUnconstrained])
+    return NO;
+
+  return [super shouldConstrainFrameRect];
+}
+
 @end  // @implementation BrowserWindowController(Private)