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

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index fd0f51ca7d38f92ec8bf9f4d8e17b4cd052e75c0..0c4358f0011424d7a91626c76919513d6b77f33d 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -83,6 +83,7 @@
 #include "core/dom/IntersectionObserverController.h"
 #include "core/dom/LayoutTreeBuilderTraversal.h"
 #include "core/dom/LiveNodeList.h"
+#include "core/dom/MediaIPHManager.h"
 #include "core/dom/MutationObserver.h"
 #include "core/dom/NodeChildRemovalTracker.h"
 #include "core/dom/NodeComputedStyle.h"
@@ -2304,6 +2305,8 @@ void Document::LayoutUpdated() {
   }
 
   root_scroller_controller_->DidUpdateLayout();
+  if (media_iph_manager_)
+    media_iph_manager_->LayoutUpdated();
 }
 
 void Document::ClearFocusedElementSoon() {
@@ -2677,6 +2680,8 @@ void Document::Shutdown() {
   // should be renamed, or this setting of the frame to 0 could be made
   // explicit in each of the callers of Document::detachLayoutTree().
   frame_ = nullptr;
+
+  media_iph_manager_ = nullptr;
 }
 
 void Document::RemoveAllEventListeners() {
@@ -6794,6 +6799,17 @@ CoreProbeSink* Document::GetProbeSink() {
   return probe::ToCoreProbeSink(frame);
 }
 
+MediaIPHManager* Document::GetMediaIPHManager() {
+  if (!media_iph_manager_ && GetFrame()) {
+    std::unique_ptr<WebMediaIPH> media_iph(
+        GetFrame()->GetPage()->GetChromeClient().CreateWebMediaIPH(GetFrame()));
+    if (media_iph)
+      media_iph_manager_ = MediaIPHManager::Create(std::move(media_iph));
+  }
+
+  return media_iph_manager_;
+}
+
 DEFINE_TRACE(Document) {
   visitor->Trace(imports_controller_);
   visitor->Trace(doc_type_);
@@ -6850,6 +6866,7 @@ DEFINE_TRACE(Document) {
   visitor->Trace(resize_observer_controller_);
   visitor->Trace(property_registry_);
   visitor->Trace(network_state_observer_);
+  visitor->Trace(media_iph_manager_);
   Supplementable<Document>::Trace(visitor);
   TreeScope::Trace(visitor);
   ContainerNode::Trace(visitor);