Show picker for temporal input elements on Android

This CL makes sure the showPicker() method actually shows the picker
on Android. It wasn't the case with the previous CL[1] because
MultipleFieldsTemporalInputTypeView is only supported on Desktop.
ChooserOnlyTemporalInputTypeView is the class to update to add support
for showPicker() on Android.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/3056920

Change-Id: Ibab81e7d54c6c8e5442aef1d60f4b1cde3dba2c6
Test: https://show-picker.glitch.me/
Spec: whatwg/html#6909
Bug: 939561
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3263866
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#938980}
NOKEYCHECK=True
GitOrigin-RevId: 43f41a8d8039ce72ca983f5892c4484e16d364d1

blink/renderer/core/html/forms/chooser_only_temporal_input_type_view.cc

@@ -63,19 +63,27 @@ void ChooserOnlyTemporalInputTypeView::HandleDOMActivateEvent(Event& event) {
 
   if (date_time_chooser_)
     return;
-  if (!document.IsActive())
-    return;
-  DateTimeChooserParameters parameters;
-  if (!GetElement().SetupDateTimeChooserParameters(parameters))
+  // SetupDateTimeChooserParameters() in OpenPopupView() early-outs if we
+  // don't have a View, so do the same here just to avoid adding to the
+  // use counter.
+  if (!document.IsActive() || !document.View())
     return;
   UseCounter::Count(
       document,
       (event.UnderlyingEvent() && event.UnderlyingEvent()->isTrusted())
           ? WebFeature::kTemporalInputTypeChooserByTrustedClick
           : WebFeature::kTemporalInputTypeChooserByUntrustedClick);
-  date_time_chooser_ =
-      document.GetPage()->GetChromeClient().OpenDateTimeChooser(
-          document.GetFrame(), this, parameters);
+  OpenPopupView();
+}
+
+void ChooserOnlyTemporalInputTypeView::OpenPopupView() {
+  DateTimeChooserParameters parameters;
+  if (GetElement().SetupDateTimeChooserParameters(parameters)) {
+    Document& document = GetElement().GetDocument();
+    date_time_chooser_ =
+        document.GetPage()->GetChromeClient().OpenDateTimeChooser(
+            document.GetFrame(), this, parameters);
+  }
 }
 
 void ChooserOnlyTemporalInputTypeView::CreateShadowSubtree() {

blink/renderer/core/html/forms/chooser_only_temporal_input_type_view.h

@@ -55,6 +55,7 @@ class ChooserOnlyTemporalInputTypeView final
   void ValueAttributeChanged() override;
   void DidSetValue(const String&, bool value_changed) override;
   void HandleDOMActivateEvent(Event&) override;
+  void OpenPopupView() override;
   void UpdateView() override;
 
   // DateTimeChooserClient functions: