media_controls: Add UI for showing a promo bubble on a control button.

third_party/WebKit/Source/modules/media_controls/elements/MediaControlDownloadButtonElement.cpp

 // 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 "modules/media_controls/elements/MediaControlDownloadButtonElement.h"
 
 #include "core/InputTypeNames.h"
 #include "core/events/Event.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/media/HTMLMediaElementControlsList.h"
 #include "core/html/media/HTMLMediaSource.h"
 #include "core/page/Page.h"
 #include "modules/media_controls/MediaControlsImpl.h"
 #include "platform/Histogram.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
+MediaControlDownloadButtonContainer::MediaControlDownloadButtonContainer(
+    MediaControlsImpl& controls)
+    : MediaControlDivElement(controls, kMediaDownloadButtonContainer) {
+  SetShadowPseudoId(
+      AtomicString("-internal-media-controls-download-button-container"));
+}
+
+bool MediaControlDownloadButtonContainer::KeepEventInNode(Event* event) {
+  return MediaControlElementsHelper::IsUserInteractionEvent(event);
+}
+
 MediaControlDownloadButtonElement::MediaControlDownloadButtonElement(
     MediaControlsImpl& media_controls)
     : MediaControlInputElement(media_controls, kMediaDownloadButton) {
   EnsureUserAgentShadowRoot();
   setType(InputTypeNames::button);
   SetShadowPseudoId(AtomicString("-internal-media-controls-download-button"));
   SetIsWanted(false);
 }
 
 bool MediaControlDownloadButtonElement::ShouldDisplayDownloadButton() {
@@ skipping 95 matching lines @@
 
 void MediaControlDownloadButtonElement::RecordMetrics(
     DownloadActionMetrics metric) {
   DEFINE_STATIC_LOCAL(EnumerationHistogram, download_action_histogram,
                       ("Media.Controls.Download",
                        static_cast<int>(DownloadActionMetrics::kCount)));
   download_action_histogram.Count(static_cast<int>(metric));
 }
 
 }  // namespace blink