chrome/blink: Add functionality for in-product help for media elements.

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 9dda656be646616934a39358464502cf5fea5e37..6be35f5207fdd7148942936031106ace913283e0 100644
--- a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
@@ -581,6 +581,7 @@ void MediaControlsImpl::MaybeShow() {
   // Only make the controls visible if they won't get hidden by OnTimeUpdate.
   if (MediaElement().paused() || !ShouldHideMediaControls())
     MakeOpaque();
+  download_button_->MaybeDispatchInProductHelpTrigger();
 }
 
 void MediaControlsImpl::Hide() {
@@ -588,6 +589,11 @@ void MediaControlsImpl::Hide() {
   panel_->SetIsDisplayed(false);
   if (overlay_play_button_)
     overlay_play_button_->SetIsWanted(false);
+  download_button_->DismissInProductHelp();
+}
+
+bool MediaControlsImpl::CanShow() const {
+  return panel_->IsWanted();
 }
 
 bool MediaControlsImpl::IsVisible() const {
@@ -643,6 +649,10 @@ bool MediaControlsImpl::ShouldHideMediaControls(unsigned behavior_flags) const {
   if (text_track_list_->IsWanted() || overflow_list_->IsWanted())
     return false;
 
+  // Don't hide the media controls while the in product help is showing.
+  if (download_button_->IsShowingInProductHelp())
+    return false;
+
   return true;
 }
 
@@ -826,8 +836,7 @@ void MediaControlsImpl::DefaultEventHandler(Event* event) {
       is_mouse_over_controls_ = true;
       if (!MediaElement().paused()) {
         MakeOpaque();
-        if (ShouldHideMediaControls())
-          StartHideMediaControlsTimer();
+        StartHideMediaControlsIfNecessary();
       }
     }
     return;
@@ -971,6 +980,7 @@ void MediaControlsImpl::OnPlay() {
   UpdatePlayState();
   timeline_->SetPosition(MediaElement().currentTime());
   UpdateCurrentTimeDisplay();
+  download_button_->MaybeDispatchInProductHelpTrigger();
 }
 
 void MediaControlsImpl::OnPlaying() {
@@ -1216,6 +1226,11 @@ void MediaControlsImpl::HideAllMenus() {
     text_track_list_->SetVisible(false);
 }
 
+void MediaControlsImpl::StartHideMediaControlsIfNecessary() {
+  if (ShouldHideMediaControls())
+    StartHideMediaControlsTimer();
+}
+
 DEFINE_TRACE(MediaControlsImpl) {
   visitor->Trace(element_mutation_callback_);
   visitor->Trace(resize_observer_);