Fix multiline label in AssistantOnboardingSuggestionView.

The label is being given only enough height for a single line of text
despite being a multiline line label with max of 2 lines.

Bug: b:169806293
Change-Id: I8d9374270dff1a0aa43c6b397aea0462474efe2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441685Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#812845}

ash/assistant/ui/main_stage/assistant_onboarding_suggestion_view.cc

@@ -216,6 +216,10 @@ void AssistantOnboardingSuggestionView::InitLayout(
       views::FlexSpecification(views::MinimumFlexSizeRule::kScaleToZero,
                                views::MaximumFlexSizeRule::kUnbounded));
   label_->SetText(base::UTF8ToUTF16(suggestion.text));
+
+  // Workaround issue where multiline label is not allocated enough height.
+  label_->SetPreferredSize(
+      gfx::Size(label_->GetPreferredSize().width(), 2 * kLabelLineHeight));
 }
 
 void AssistantOnboardingSuggestionView::UpdateIcon(const gfx::ImageSkia& icon) {