[Mac] Refactor the Fullscreen Toolbar

base/mac/mac_util.mm

Index: base/mac/mac_util.mm
diff --git a/base/mac/mac_util.mm b/base/mac/mac_util.mm
index 2f54b2799b5b01932b94fce98a63e5145ebae94b..5aaaa3cc462328b4617925888c255604d630b976 100644
--- a/base/mac/mac_util.mm
+++ b/base/mac/mac_util.mm
@@ -173,6 +173,10 @@ CGColorSpaceRef GetSystemColorSpace() {
   return g_system_color_space;
 }
 
+bool IsCGFloatEqual(CGFloat a, CGFloat b) {
+  return fabs(a - b) <= std::numeric_limits<CGFloat>::epsilon();
+}
+
 // Add a request for full screen mode.  Must be called on the main thread.
 void RequestFullScreen(FullScreenMode mode) {
   DCHECK_LT(mode, kNumFullScreenModes);