Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/framed_browser_window.mm

Index: chrome/browser/ui/cocoa/framed_browser_window.mm
diff --git a/chrome/browser/ui/cocoa/framed_browser_window.mm b/chrome/browser/ui/cocoa/framed_browser_window.mm
index 5d098be8d3c00a47cd7a24ab4c2703c7ba498748..e1b0de04aa98978f6426de971e511790c61b11e0 100644
--- a/chrome/browser/ui/cocoa/framed_browser_window.mm
+++ b/chrome/browser/ui/cocoa/framed_browser_window.mm
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/mac/sdk_forward_declarations.h"
+#include "base/metrics/histogram.h"
 #include "chrome/browser/global_keyboard_shortcuts_mac.h"
 #include "chrome/browser/profiles/profile_avatar_icon_util.h"
 #include "chrome/browser/themes/theme_properties.h"
@@ -31,8 +32,19 @@ namespace {
 // like what the heuristic does when there are just a few tabs.
 const CGFloat kWindowGradientHeight = 24.0;
 
+enum FrameBrowserWindowLock {
+  SET_FRAME_LOCKED = 0,
+  SET_STYLEMASK_LOCKED = 1,
+  FRAMEBROWSERWINDOWLOCKCOUNT = 2
+};
+
+void LogUMASample(FrameBrowserWindowLock sample) {
+  UMA_HISTOGRAM_ENUMERATION("FramedBrowserWindowLock", sample,
+                            FRAMEBROWSERWINDOWLOCKCOUNT);
 }
 
+}  // namespace
+
 @interface FramedBrowserWindow (Private)
 
 - (void)adjustCloseButton:(NSNotification*)notification;
@@ -40,11 +52,30 @@ const CGFloat kWindowGradientHeight = 24.0;
 - (void)adjustZoomButton:(NSNotification*)notification;
 - (void)adjustButton:(NSButton*)button
               ofKind:(NSWindowButton)kind;
+- (void)logUMASample:(FrameBrowserWindowLock)sample;
 
 @end
 
 @implementation FramedBrowserWindow
 
+- (void)setStyleMask:(NSUInteger)styleMask {
+  if (frameAndStyleMaskLock_) {
+    LogUMASample(FrameBrowserWindowLock::SET_FRAME_LOCKED);
+    return;
+  }
+  [super setStyleMask:styleMask];
+}
+
+- (void)setFrame:(NSRect)frameRect
+         display:(BOOL)flag
+         animate:(BOOL)animateFlag {
+  if (frameAndStyleMaskLock_) {
+    LogUMASample(FrameBrowserWindowLock::SET_STYLEMASK_LOCKED);
+    return;
+  }
+  [super setFrame:frameRect display:flag animate:animateFlag];
+}
+
 - (id)initWithContentRect:(NSRect)contentRect
               hasTabStrip:(BOOL)hasTabStrip{
   NSUInteger styleMask = NSTitledWindowMask |
@@ -97,6 +128,8 @@ const CGFloat kWindowGradientHeight = 24.0;
                selector:@selector(adjustZoomButton:)
                    name:NSViewFrameDidChangeNotification
                  object:zoomButton_];
+
+    frameAndStyleMaskLock_ = NO;
   }
 
   return self;
@@ -177,6 +210,12 @@ const CGFloat kWindowGradientHeight = 24.0;
   shouldHideTitle_ = flag;
 }
 
+// This method sets a lock which prevents the the frame and style
+// of the window to be changed
+- (void)setFrameAndStyleMaskLock:(BOOL)lock {
+  frameAndStyleMaskLock_ = lock;
+}
+
 - (BOOL)_isTitleHidden {
   return shouldHideTitle_;
 }