Making answer card to behave like other results.

chrome/browser/ui/app_list/search_answer_web_contents_delegate.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/app_list/search_answer_web_contents_delegate.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_navigator_params.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/common/renderer_preferences.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_status_code.h"
 #include "ui/app_list/app_list_features.h"
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/search_box_model.h"
+#include "ui/views/controls/webview/web_contents_set_background_color.h"
 #include "ui/views/controls/webview/webview.h"
 #include "ui/views/widget/widget.h"
 
 namespace app_list {
 
 namespace {
 
 enum class SearchAnswerRequestResult {
   REQUEST_RESULT_ANOTHER_REQUEST_STARTED = 0,
   REQUEST_RESULT_REQUEST_FAILED = 1,
@@ skipping 64 matching lines @@
   web_contents_->GetRenderViewHost()->SyncRendererPrefs();
 
   Observe(web_contents_.get());
   web_contents_->SetDelegate(this);
   web_view_->set_owned_by_client();
   web_view_->SetWebContents(web_contents_.get());
   if (features::IsAnswerCardDarkRunEnabled())
     web_view_->SetFocusBehavior(views::View::FocusBehavior::NEVER);
 
   model->AddObserver(this);
+
+  // Make the webview transparent since it's going to be shown on top of a
+  // highlightable button.
+  views::WebContentsSetBackgroundColor::CreateForWebContentsWithColor(
+      web_contents_.get(), SK_ColorTRANSPARENT);
 }
 
 SearchAnswerWebContentsDelegate::~SearchAnswerWebContentsDelegate() {
   RecordReceivedAnswerFinalResult();
   model_->RemoveObserver(this);
 }
 
 views::View* SearchAnswerWebContentsDelegate::web_view() {
   return web_view_.get();
 }
@@ skipping 43 matching lines @@
   web_contents_->GetRenderViewHost()->EnablePreferredSizeMode();
 }
 
 void SearchAnswerWebContentsDelegate::UpdatePreferredSize(
     content::WebContents* web_contents,
     const gfx::Size& pref_size) {
   is_card_size_ok_ =
       IsCardSizeOk(pref_size) || features::IsAnswerCardDarkRunEnabled();
   model_->SetSearchAnswerAvailable(is_card_size_ok_ && received_answer_ &&
                                    !web_contents_->IsLoading());
-  if (!features::IsAnswerCardDarkRunEnabled())
-    web_view_->SetPreferredSize(pref_size);
+  web_view_->SetPreferredSize(pref_size);
   if (!answer_loaded_time_.is_null()) {
     UMA_HISTOGRAM_TIMES("SearchAnswer.ResizeAfterLoadTime",
                         base::TimeTicks::Now() - answer_loaded_time_);
   }
 }
 
 content::WebContents* SearchAnswerWebContentsDelegate::OpenURLFromTab(
     content::WebContents* source,
     const content::OpenURLParams& params) {
   if (!params.user_gesture)
@@ skipping 93 matching lines @@
     return;
 
   RecordRequestResult(
       is_card_size_ok_
           ? SearchAnswerRequestResult::REQUEST_RESULT_RECEIVED_ANSWER
           : SearchAnswerRequestResult::
                 REQUEST_RESULT_RECEIVED_ANSWER_TOO_LARGE);
 }
 
 }  // namespace app_list