[iOS] Do not reset the location bar font size on rotation.

Avoids resetting the scale when -resetTransform is called.

Bug: 869379
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Id649065208060cf1c3fbd4394947acad2f67cec3
Reviewed-on: https://chromium-review.googlesource.com/1180896Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584414}

ios/chrome/browser/ui/location_bar/location_bar_view_controller.mm

@@ -287,8 +287,17 @@ typedef NS_ENUM(int, TrailingButtonState) {
 }
 
 - (void)resetTransforms {
-  self.editView.transform = CGAffineTransformIdentity;
-  self.locationBarSteadyView.transform = CGAffineTransformIdentity;
+  // Focus/defocus animations only affect translations and not scale. So reset
+  // translation and keep the scale.
+  self.editView.transform = CGAffineTransformMake(
+      self.editView.transform.a, self.editView.transform.b,
+      self.editView.transform.c, self.editView.transform.d, 0, 0);
+  self.locationBarSteadyView.transform =
+      CGAffineTransformMake(self.locationBarSteadyView.transform.a,
+                            self.locationBarSteadyView.transform.b,
+                            self.locationBarSteadyView.transform.c,
+                            self.locationBarSteadyView.transform.d, 0, 0);
+  ;
 }
 
 #pragma mark animation helpers

ios/chrome/browser/ui/orchestrator/location_bar_animatee.h

@@ -31,6 +31,7 @@
 - (void)setSteadyViewHidden:(BOOL)hidden;
 
 // Resets tranforms of edit and steady view. Used for post-animation cleanup.
+// Only resets the translation, and leaves scale intact.
 - (void)resetTransforms;
 
 @end