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

chrome/browser/android/media_in_product_help_manager.cc

Index: chrome/browser/android/media_in_product_help_manager.cc
diff --git a/chrome/browser/android/media_in_product_help_manager.cc b/chrome/browser/android/media_in_product_help_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..29a6958a28916cb528058248a73bef4d4ab17a36
--- /dev/null
+++ b/chrome/browser/android/media_in_product_help_manager.cc
@@ -0,0 +1,117 @@
+// 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/browser/android/media_in_product_help_manager.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/optional.h"
+#include "content/public/browser/navigation_handle.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "services/service_manager/public/cpp/bind_source_info.h"
+#include "services/service_manager/public/cpp/interface_provider.h"
+
+namespace {
+
+void SendDismissUIToRenderer(content::RenderFrameHost* render_frame_host) {
+  blink::mojom::MediaInProductHelpDelegateServicePtr delegate_service;
+  render_frame_host->GetRemoteInterfaces()->GetInterface(&delegate_service);
+  delegate_service->WidgetDismissed();
+}
+
+}  // namespace
+
+class MediaInProductHelpManager::MediaInProductHelpService
+    : public blink::mojom::MediaInProductHelpService {
+ public:
+  MediaInProductHelpService(content::RenderFrameHost* render_frame_host,
+                            MediaInProductHelpManager* manager)
+      : render_frame_host_(render_frame_host), manager_(manager) {
+    DCHECK(render_frame_host_);
+    DCHECK(manager_);
+  }
+  ~MediaInProductHelpService() override = default;
+
+  // blink::mojom::MediaPromoUI implementation.
+  void ShowInProductHelpWidget(int x, int y, int width, int height) override {
+    manager_->ShowInProductHelpWidget(render_frame_host_,
+                                      gfx::Rect(x, y, width, height));
+  }
+
+  void HideInProductHelpWidget() override {
+    manager_->HideInProductHelpWidget(render_frame_host_);
+  }
+
+ private:
+  content::RenderFrameHost* render_frame_host_;
+  MediaInProductHelpManager* manager_;
+};
+
+MediaInProductHelpManager::MediaInProductHelpManager(
+    content::WebContents* web_contents,
+    MediaInProductHelpManagerClient* client)
+    : WebContentsObserver(web_contents), client_(client), weak_factory_(this) {
+  DCHECK(client_);
+}
+
+MediaInProductHelpManager::~MediaInProductHelpManager() {
+  if (active_render_frame_host_) {
+    client_->DismissMediaDownloadInProductHelp();
+  }
+}
+
+void MediaInProductHelpManager::WidgetDismissed() {
+  DCHECK(active_render_frame_host_);
+
+  SendDismissUIToRenderer(active_render_frame_host_);
+  active_render_frame_host_ = nullptr;
+}
+
+void MediaInProductHelpManager::RenderFrameCreated(
+    content::RenderFrameHost* render_frame_host) {
+  // Register the bridge service for the renderer to request showing the UI.
+  render_frame_host->GetInterfaceRegistry()->AddInterface(
+      base::Bind(&MediaInProductHelpManager::CreateInProductHelpService,
+                 weak_factory_.GetWeakPtr(), render_frame_host));
+}
+
+void MediaInProductHelpManager::RenderFrameDeleted(
+    content::RenderFrameHost* render_frame_host) {
+  if (active_render_frame_host_ != render_frame_host)
+    return;
+  client_->DismissMediaDownloadInProductHelp();
+}
+
+void MediaInProductHelpManager::CreateInProductHelpService(
+    content::RenderFrameHost* render_frame_host,
+    const service_manager::BindSourceInfo& source_info,
+    blink::mojom::MediaInProductHelpServiceRequest request) {
+  mojo::MakeStrongBinding(
+      base::MakeUnique<MediaInProductHelpService>(render_frame_host, this),
+      std::move(request));
+}
+
+void MediaInProductHelpManager::ShowInProductHelpWidget(
+    content::RenderFrameHost* render_frame_host,
+    const gfx::Rect& rect_in_main_frame) {
+  if (active_render_frame_host_ &&
+      active_render_frame_host_ != render_frame_host) {
+    // If we are currently showing the UI for another frame, inform the
+    // requesting frame that the widget can not be shown.
+    SendDismissUIToRenderer(render_frame_host);
+    return;
+  }
+
+  active_render_frame_host_ = render_frame_host;
+  client_->ShowMediaDownloadInProductHelp(rect_in_main_frame);
+}
+
+void MediaInProductHelpManager::HideInProductHelpWidget(
+    content::RenderFrameHost* render_frame_host) {
+  // We might have dismissed the widget for this frame already.
+  if (active_render_frame_host_ != render_frame_host)
+    return;
+  client_->DismissMediaDownloadInProductHelp();
+}