[ios] Add pointer interaction to translate infobar

iOS 13.4 introduces new APIs for mouse cursor support on iPad.

Test: iPad-only. Ensure that translate infobar buttons (gear, close, source and destination languages) have hover effect.
Bug: 1073961
Change-Id: I77efa66691f1818f3d66222d1346387042b583ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199722Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768573}

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

@@ -65,6 +65,7 @@ source_set("translate_ui") {
     "//components/strings:components_strings",
     "//ios/chrome/app/strings:ios_strings_grit",
     "//ios/chrome/browser",
+    "//ios/chrome/browser/ui:feature_flags",
     "//ios/chrome/browser/ui/colors",
     "//ios/chrome/browser/ui/commands",
     "//ios/chrome/browser/ui/fullscreen:ui",

ios/chrome/browser/ui/translate/translate_infobar_language_tab_view.mm

@@ -4,9 +4,11 @@
 
 #import "ios/chrome/browser/ui/translate/translate_infobar_language_tab_view.h"
 
+#include "base/feature_list.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/translate/translate_infobar_language_tab_strip_view.h"
 #import "ios/chrome/browser/ui/translate/translate_infobar_language_tab_view_delegate.h"
+#include "ios/chrome/browser/ui/ui_feature_flags.h"
 #import "ios/chrome/browser/ui/util/uikit_ui_util.h"
 #import "ios/chrome/common/ui/colors/semantic_color_names.h"
 #import "ios/chrome/common/ui/elements/highlight_button.h"
@@ -106,6 +108,14 @@ const CGFloat kButtonPadding = 12;
         forControlEvents:UIControlEventTouchUpInside];
   [self addSubview:self.button];
 
+#if defined(__IPHONE_13_4)
+  if (@available(iOS 13.4, *)) {
+    if (base::FeatureList::IsEnabled(kPointerSupport)) {
+      self.button.pointerInteractionEnabled = YES;
+    }
+  }
+#endif  // defined(__IPHONE_13_4)
+
   AddSameConstraints(self, self.button);
 }
 

ios/chrome/browser/ui/translate/translate_infobar_view.mm

@@ -5,6 +5,7 @@
 #import "ios/chrome/browser/ui/translate/translate_infobar_view.h"
 
 #include "base/check.h"
+#include "base/feature_list.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/procedural_block_types.h"
@@ -17,6 +18,7 @@
 #import "ios/chrome/browser/ui/translate/translate_infobar_language_tab_strip_view_delegate.h"
 #import "ios/chrome/browser/ui/translate/translate_infobar_view_constants.h"
 #import "ios/chrome/browser/ui/translate/translate_infobar_view_delegate.h"
+#include "ios/chrome/browser/ui/ui_feature_flags.h"
 #import "ios/chrome/browser/ui/util/label_link_controller.h"
 #import "ios/chrome/browser/ui/util/layout_guide_names.h"
 #import "ios/chrome/browser/ui/util/named_guide.h"
@@ -286,6 +288,15 @@ const CGFloat kIconTrailingMargin = 12;
   self.dismissButton = dismissButton;
   [contentView addSubview:self.dismissButton];
 
+#if defined(__IPHONE_13_4)
+  if (@available(iOS 13.4, *)) {
+    if (base::FeatureList::IsEnabled(kPointerSupport)) {
+      self.optionsButton.pointerInteractionEnabled = YES;
+      self.dismissButton.pointerInteractionEnabled = YES;
+    }
+  }
+#endif  // defined(__IPHONE_13_4)
+
   ApplyVisualConstraintsWithMetrics(
       @[
         @"H:|-(iconLeadingMargin)-[icon(iconSize)]-(iconTrailingMargin)-[languages][options(buttonSize)][dismiss(buttonSize)]|",