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

third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp

Index: third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
diff --git a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
index 2f32c0510fc28434d2ae7adb85c8c19b4a0dfffc..b3cb2bafd63c6d4f833b83f013c092d488645b0f 100644
--- a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
@@ -51,6 +51,7 @@
 #include "modules/media_controls/MediaControlsOrientationLockDelegate.h"
 #include "modules/media_controls/MediaControlsRotateToFullscreenDelegate.h"
 #include "modules/media_controls/MediaControlsWindowEventListener.h"
+#include "modules/media_controls/elements/MediaControlButtonPromoElements.h"
 #include "modules/media_controls/elements/MediaControlCastButtonElement.h"
 #include "modules/media_controls/elements/MediaControlCurrentTimeDisplayElement.h"
 #include "modules/media_controls/elements/MediaControlDownloadButtonElement.h"
@@ -423,8 +424,11 @@ void MediaControlsImpl::InitializeControls() {
   fullscreen_button_ = new MediaControlFullscreenButtonElement(*this);
   panel_->AppendChild(fullscreen_button_);
 
+  download_button_container_ = new MediaControlDownloadButtonContainer(*this);
+  panel_->AppendChild(download_button_container_);
+
   download_button_ = new MediaControlDownloadButtonElement(*this);
-  panel_->AppendChild(download_button_);
+  download_button_container_->AppendChild(download_button_);
 
   cast_button_ = new MediaControlCastButtonElement(*this, false);
   panel_->AppendChild(cast_button_);
@@ -465,6 +469,19 @@ void MediaControlsImpl::InitializeControls() {
           *this, new MediaControlToggleClosedCaptionsButtonElement(*this)));
 }
 
+void MediaControlsImpl::CreateDownloadButtonPromoUI() {
+  download_promo_container_ = new MediaControlButtonPromoContainer(
+      *this, kMediaDownloadButtonPromoText,
+      WebLocalizedString::kDownloadButtonPromoText);
+  download_button_container_->AppendChild(download_promo_container_);
+}
+
+void MediaControlsImpl::UpdateDownloadButtonWantedState() {
+  bool should_display = download_button_->ShouldDisplayDownloadButton();
+  download_button_->SetIsWanted(should_display);
+  download_button_container_->SetIsWanted(should_display);
+}
+
 Node::InsertionNotificationRequest MediaControlsImpl::InsertedInto(
     ContainerNode* root) {
   if (!MediaElement().isConnected())
@@ -559,9 +576,7 @@ void MediaControlsImpl::OnControlsListUpdated() {
   fullscreen_button_->SetIsWanted(ShouldShowFullscreenButton(MediaElement()));
 
   RefreshCastButtonVisibilityWithoutUpdate();
-
-  download_button_->SetIsWanted(
-      download_button_->ShouldDisplayDownloadButton());
+  UpdateDownloadButtonWantedState();
 }
 
 LayoutObject* MediaControlsImpl::PanelLayoutObject() {
@@ -1169,8 +1184,7 @@ void MediaControlsImpl::NetworkStateChanged() {
 
   // Update the display state of the download button in case we now have a
   // source or no longer have a source.
-  download_button_->SetIsWanted(
-      download_button_->ShouldDisplayDownloadButton());
+  UpdateDownloadButtonWantedState();
 }
 
 bool MediaControlsImpl::OverflowMenuVisible() {
@@ -1208,6 +1222,8 @@ DEFINE_TRACE(MediaControlsImpl) {
   visitor->Trace(toggle_closed_captions_button_);
   visitor->Trace(fullscreen_button_);
   visitor->Trace(download_button_);
+  visitor->Trace(download_button_container_);
+  visitor->Trace(download_promo_container_);
   visitor->Trace(duration_display_);
   visitor->Trace(enclosure_);
   visitor->Trace(text_track_list_);