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

chrome/renderer/media/media_iph_impl.cc

+// 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 "chrome/renderer/media/media_iph_impl.h"
+
+#include "content/public/renderer/render_frame.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "services/service_manager/public/cpp/binder_registry.h"
+#include "services/service_manager/public/cpp/interface_provider.h"
+#include "third_party/WebKit/public/platform/WebRect.h"
+
+class MediaIPHImpl::MediaIPHDelegateService
+    : public chrome::mojom::MediaIPHDelegateService {
+ public:
+  explicit MediaIPHDelegateService(MediaIPHImpl* media_iph_impl)
+      : media_iph_impl_(media_iph_impl) {
+    DCHECK(media_iph_impl_);
+  }
+  ~MediaIPHDelegateService() override = default;
+
+  // chrome::MediaIPHDelegateService implementation.
+  void WidgetDismissed() override { media_iph_impl_->IPHWidgetDismissed(); }
+
+ private:
+  MediaIPHImpl* media_iph_impl_;
+};
+
+MediaIPHImpl::MediaIPHImpl(content::RenderFrame* render_frame)
+    : render_frame_(render_frame), weak_factory_(this) {
+  render_frame_->GetInterfaceRegistry()->AddInterface(base::Bind(
+      &MediaIPHImpl::CreateDelegateService, weak_factory_.GetWeakPtr()));
+}
+
+MediaIPHImpl::~MediaIPHImpl() {
+  if (client_)
+    client_->DidHideMediaIPHWidget();
+}
+
+void MediaIPHImpl::BindToClient(blink::WebMediaIPHClient* client) {
+  DCHECK(!client_);
+  client_ = client;
+}
+
+void MediaIPHImpl::ShowMediaDownloadIPH(const blink::WebRect& rect) {
+  bool new_request = !iph_active_;
+  iph_active_ = true;
+
+  chrome::mojom::MediaIPHServicePtr iph_service;
+  render_frame_->GetRemoteInterfaces()->GetInterface(&iph_service);
+  iph_service->ShowIPHWidget(rect, new_request);
+}
+
+void MediaIPHImpl::HideMediaDownloadIPH() {
+  chrome::mojom::MediaIPHServicePtr iph_service;
+  render_frame_->GetRemoteInterfaces()->GetInterface(&iph_service);
+  iph_service->HideIPHWidget();
+}
+
+void MediaIPHImpl::CreateDelegateService(
+    const service_manager::BindSourceInfo& source_info,
+    chrome::mojom::MediaIPHDelegateServiceRequest request) {
+  mojo::MakeStrongBinding(base::MakeUnique<MediaIPHDelegateService>(this),
+                          std::move(request));
+}
+
+void MediaIPHImpl::IPHWidgetDismissed() {
+  DCHECK(client_);
+  iph_active_ = false;
+  client_->DidHideMediaIPHWidget();
+}