[iOS][Thumb Strip] Compare GCFloats with AreCGFloatsEqual

Bug: N/A
Change-Id: I8e50aadb524f698ea259995d6ff90a90918e7dc1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618678
Auto-Submit: Javier Flores <javierrobles@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841978}

ios/chrome/browser/ui/gestures/BUILD.gn

@@ -16,6 +16,7 @@ source_set("gestures") {
   ]
   deps = [
     "//base",
+    "//ios/chrome/browser/ui/util",
     "//ios/web/public/ui",
   ]
   configs += [ "//build/config/compiler:enable_arc" ]

ios/chrome/browser/ui/gestures/view_revealing_vertical_pan_handler.mm

@@ -9,6 +9,7 @@
 #include "base/numerics/ranges.h"
 #import "ios/chrome/browser/ui/gestures/layout_switcher.h"
 #import "ios/chrome/browser/ui/gestures/pan_handler_scroll_view.h"
+#include "ios/chrome/browser/ui/util/ui_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ -435,7 +436,7 @@ const CGFloat kAnimationDuration = 0.25f;
       // starts dragging from the top.
       CGFloat contentOffsetY =
           scrollView.contentOffset.y + scrollView.contentInset.top;
-      if (contentOffsetY != 0) {
+      if (!AreCGFloatsEqual(contentOffsetY, 0.0)) {
         return;
       }
       break;