Implemented fullscreen exit animation with AppKit

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index f048b5b4ea5efea832941b66aeb24a7ad691b4a9..40e189fc7f997bea6cef94bd3297bcd622013f72 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -12406,6 +12406,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="FullScreenExitTransition.FrameAndStyleMaskLock"
+    enum="FramedBrowserWindowLock">
+  <owner>spqchan@chromium.com</owner>
+  <summary>
+    Number of times when AppKit's call to setFrame and setStyleMask in
+    FrameBrowserWindow gets ignored.
+  </summary>
+</histogram>
+
+<histogram name="FullScreenExitTransition.TransitionCount">
+  <owner>spqchan@chromium.com</owner>
+  <summary>
+    Number of times when the browser window exit fullscreen using the animations
+    from FullScreenTransition. We want to ensure that the counts in
+    FullScreenExitTransition.FrameAndStyleMaskLock do not exceed this one.
+  </summary>
+</histogram>
+
 <histogram name="GCM.APICallUnregister">
   <owner>jianli@chromium.org</owner>
   <summary>Number of times when gcm.unregister API is called.</summary>
@@ -59157,6 +59175,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="5" label="GNOME failure"/>
 </enum>
 
+<enum name="FramedBrowserWindowLock" type="int">
+  <int value="0" label="setStyleMask call from AppKit is ignored"/>
+  <int value="1" label="setFrame call from AppKit is ignored"/>
+</enum>
+
 <enum name="FtpDataConnectionError" type="int">
   <int value="0">Data connection successful</int>
   <int value="1">Local firewall blocked the connection</int>