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

third_party/WebKit/Source/core/frame/LocalFrame.cpp

Index: third_party/WebKit/Source/core/frame/LocalFrame.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.cpp b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
index 68560d692093b4bbe2ab1ab902a56aa743f1ff3b..ada7d248ee7ddfcb5a9dd447e493fe8b1451be68 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
@@ -54,6 +54,7 @@
 #include "core/frame/Settings.h"
 #include "core/frame/VisualViewport.h"
 #include "core/html/HTMLFrameElementBase.h"
+#include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/html/PluginDocument.h"
 #include "core/input/EventHandler.h"
@@ -79,6 +80,7 @@
 #include "core/probe/CoreProbes.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/timing/Performance.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 #include "platform/DragImage.h"
 #include "platform/Histogram.h"
 #include "platform/PluginScriptForbiddenScope.h"
@@ -106,6 +108,9 @@
 #include "public/platform/InterfaceRegistry.h"
 #include "public/platform/WebScreenInfo.h"
 #include "public/platform/WebURLRequest.h"
+#include "public/platform/media_in_product_help.mojom-blink.h"
+#include "services/service_manager/public/cpp/bind_source_info.h"
+#include "services/service_manager/public/cpp/interface_provider.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkSurface.h"
 
@@ -272,6 +277,30 @@ FrameInitCallbackVector& GetInitializationVector() {
   return initialization_vector;
 }
 
+class MediaInProductHelpDelegate
+    : public mojom::blink::MediaInProductHelpDelegate {
+ public:
+  explicit MediaInProductHelpDelegate(LocalFrame& frame) : frame_(&frame) {}
+  ~MediaInProductHelpDelegate() override = default;
+
+  // chrome::MediaInProductHelpDelegate implementation.
+  void WidgetDismissed() override {
+    if (frame_)
+      frame_->NotifyInProductHelpDismissed();
+  }
+
+ private:
+  WeakPersistent<LocalFrame> frame_;
+};
+
+void CreateMediaInProductHelpDelegate(
+    LocalFrame* frame,
+    mojom::blink::MediaInProductHelpDelegateRequest request) {
+  mojo::MakeStrongBinding(
+      WTF::WrapUnique(new MediaInProductHelpDelegate(*frame)),
+      std::move(request));
+}
+
 }  // namespace
 
 template class CORE_TEMPLATE_EXPORT Supplement<LocalFrame>;
@@ -382,6 +411,7 @@ DEFINE_TRACE(LocalFrame) {
   visitor->Trace(console_);
   visitor->Trace(input_method_controller_);
   visitor->Trace(frame_resource_coordinator_);
+  visitor->Trace(element_with_active_in_product_help_);
   Frame::Trace(visitor);
   Supplementable<LocalFrame>::Trace(visitor);
 }
@@ -1245,4 +1275,56 @@ void LocalFrame::SetViewportIntersectionFromParent(
   }
 }
 
+void LocalFrame::ShowDownloadMediaInProductHelp(HTMLMediaElement& elem) {
+  if (!GetSettings() || !GetSettings()->GetMediaDownloadInProductHelpEnabled())
+    return;
+
+  if (element_with_active_in_product_help_ ||
+      media_in_product_help_shown_for_frame_)
+    return;
+
+  if (!Client())
+    return;
+
+  // Add the service to know when this widget is dismissed.
+  GetInterfaceRegistry()->AddInterface(
+      WTF::Bind(&CreateMediaInProductHelpDelegate, WrapWeakPersistent(this)));
+
+  element_with_active_in_product_help_ = &elem;
+  media_in_product_help_shown_for_frame_ = true;
+}
+
+bool LocalFrame::IsDownloadMediaInProductHelpVisibleForElement(
+    HTMLMediaElement& elem) {
+  return element_with_active_in_product_help_ &&
+         *element_with_active_in_product_help_ == elem;
+}
+
+void LocalFrame::LayoutUpdated() {
+  if (!element_with_active_in_product_help_ || !Client())
+    return;
+
+  IntRect button_rect;
+  if (!element_with_active_in_product_help_->GetMediaControls()
+           ->GetDownloadButtonRect(button_rect)) {
+    mojom::blink::MediaInProductHelpPtr service;
+    Client()->GetInterfaceProvider()->GetInterface(mojo::MakeRequest(&service));
+    service->HideInProductHelpWidget();
+    return;
+  }
+
+  mojom::blink::MediaInProductHelpPtr service;
+  Client()->GetInterfaceProvider()->GetInterface(mojo::MakeRequest(&service));
+  service->ShowInProductHelpWidget(button_rect);
+}
+
+void LocalFrame::NotifyInProductHelpDismissed() {
+  if (element_with_active_in_product_help_ &&
+      element_with_active_in_product_help_->GetMediaControls()) {
+    element_with_active_in_product_help_->GetMediaControls()
+        ->InProductHelpDisabled();
+  }
+  element_with_active_in_product_help_ = nullptr;
+}
+
 }  // namespace blink