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

chrome/browser/android/tab_android.cc

Index: chrome/browser/android/tab_android.cc
diff --git a/chrome/browser/android/tab_android.cc b/chrome/browser/android/tab_android.cc
index 005669d1972a18eecc865d99ba76532548b442e1..172fd7274444f7c948952dd8b8853e0687116392 100644
--- a/chrome/browser/android/tab_android.cc
+++ b/chrome/browser/android/tab_android.cc
@@ -54,6 +54,8 @@
 #include "components/bookmarks/managed/managed_bookmark_service.h"
 #include "components/dom_distiller/core/url_utils.h"
 #include "components/favicon/content/content_favicon_driver.h"
+#include "components/feature_engagement_tracker/public/feature_constants.h"
+#include "components/feature_engagement_tracker/public/feature_list.h"
 #include "components/navigation_interception/intercept_navigation_delegate.h"
 #include "components/navigation_interception/navigation_params.h"
 #include "components/sessions/content/content_live_tab.h"
@@ -72,12 +74,15 @@
 #include "content/public/common/browser_controls_state.h"
 #include "content/public/common/resource_request_body.h"
 #include "jni/Tab_jni.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 #include "net/base/escape.h"
+#include "services/service_manager/public/cpp/bind_source_info.h"
 #include "services/service_manager/public/cpp/interface_provider.h"
 #include "skia/ext/image_operations.h"
 #include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
 #include "ui/android/view_android.h"
 #include "ui/android/window_android.h"
+#include "ui/base/layout.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/display/display.h"
@@ -98,6 +103,40 @@ using content::WebContents;
 using navigation_interception::InterceptNavigationDelegate;
 using navigation_interception::NavigationParams;
 
+// This class is created and owned by the MediaInProductHelpManager.
+class TabAndroid::MediaInProductHelp : public blink::mojom::MediaInProductHelp {
+ public:
+  MediaInProductHelp(content::RenderFrameHost* render_frame_host,
+                     TabAndroid* tab,
+                     blink::mojom::MediaInProductHelpRequest request)
+      : render_frame_host_(render_frame_host),
+        tab_(tab),
+        binding_(this, std::move(request)) {
+    DCHECK(render_frame_host_);
+    DCHECK(tab_);
+
+    binding_.set_connection_error_handler(
+        base::BindOnce(&TabAndroid::OnMediaInProductHelpConnectionError,
+                       base::Unretained(tab_)));
+  }
+  ~MediaInProductHelp() override = default;
+
+  // blink::mojom::MediaPromoUI implementation.
+  void ShowInProductHelpWidget(const gfx::Rect& rect) override {
+    tab_->ShowMediaDownloadInProductHelp(rect);
+  }
+
+  content::RenderFrameHost* render_frame_host() const {
+    return render_frame_host_;
+  }
+
+ private:
+  // The |manager_| and |render_frame_host_| outlive this class.
+  content::RenderFrameHost* render_frame_host_;
+  TabAndroid* tab_;
+  mojo::Binding<blink::mojom::MediaInProductHelp> binding_;
+};
+
 TabAndroid* TabAndroid::FromWebContents(
   const content::WebContents* web_contents) {
   const CoreTabHelper* core_tab_helper = CoreTabHelper::FromWebContents(
@@ -127,7 +166,8 @@ TabAndroid::TabAndroid(JNIEnv* env, const JavaRef<jobject>& obj)
       content_layer_(cc::Layer::Create()),
       tab_content_manager_(NULL),
       synced_tab_delegate_(new browser_sync::SyncedTabDelegateAndroid(this)),
-      embedded_media_experience_enabled_(false) {
+      embedded_media_experience_enabled_(false),
+      weak_factory_(this) {
   Java_Tab_setNativePtr(env, obj, reinterpret_cast<intptr_t>(this));
 }
 
@@ -337,6 +377,7 @@ void TabAndroid::InitWebContents(
   DCHECK(web_contents_.get());
 
   AttachTabHelpers(web_contents_.get());
+  WebContentsObserver::Observe(web_contents_.get());
 
   SetWindowSessionID(session_window_id_.id());
 
@@ -412,6 +453,7 @@ void TabAndroid::DestroyWebContents(JNIEnv* env,
       content::NOTIFICATION_NAV_ENTRY_CHANGED,
       content::Source<content::NavigationController>(
            &web_contents()->GetController()));
+  WebContentsObserver::Observe(nullptr);
 
   favicon::FaviconDriver* favicon_driver =
       favicon::ContentFaviconDriver::FromWebContents(web_contents_.get());
@@ -801,6 +843,74 @@ void TabAndroid::AttachToTabContentManager(
     tab_content_manager_->AttachLiveLayer(GetAndroidId(), GetContentLayer());
 }
 
+void TabAndroid::RenderFrameCreated(
+    content::RenderFrameHost* render_frame_host) {
+  if (base::FeatureList::IsEnabled(
+          feature_engagement_tracker::kIPHMediaDownloadFeature)) {
+    // Register the service for the renderer to request showing the UI.
+    render_frame_host->GetInterfaceRegistry()->AddInterface(
+        base::Bind(&TabAndroid::CreateInProductHelpService,
+                   weak_factory_.GetWeakPtr(), render_frame_host));
+  }
+}
+
+void TabAndroid::RenderFrameDeleted(
+    content::RenderFrameHost* render_frame_host) {
+  if (media_in_product_help_ &&
+      media_in_product_help_->render_frame_host() == render_frame_host) {
+    DismissMediaDownloadInProductHelp();
+  }
+}
+
+void TabAndroid::ShowMediaDownloadInProductHelp(
+    const gfx::Rect& rect_in_frame) {
+  DCHECK(web_contents_);
+
+  // We need to account for the browser controls offset to get the location for
+  // the widget in the view.
+  float content_offset = web_contents_->GetNativeView()->content_offset();
+  gfx::Rect rect_in_view(rect_in_frame.x(), rect_in_frame.y() + content_offset,
+                         rect_in_frame.width(), rect_in_frame.height());
+  gfx::Rect rect_in_view_scaled = gfx::ScaleToEnclosingRectSafe(
+      rect_in_view,
+      ui::GetScaleFactorForNativeView(web_contents_->GetNativeView()));
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_Tab_showMediaDownloadInProductHelp(
+      env, weak_java_tab_.get(env), rect_in_view_scaled.x(),
+      rect_in_view_scaled.y(), rect_in_view_scaled.width(),
+      rect_in_view_scaled.height());
+}
+
+void TabAndroid::DismissMediaDownloadInProductHelp() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_Tab_hideMediaDownloadInProductHelp(env, weak_java_tab_.get(env));
+}
+
+void TabAndroid::DownloadMediaInProductHelpDismissed(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj) {
+  DCHECK(media_in_product_help_);
+  media_in_product_help_.reset();
+}
+
+void TabAndroid::CreateInProductHelpService(
+    content::RenderFrameHost* render_frame_host,
+    const service_manager::BindSourceInfo& source_info,
+    blink::mojom::MediaInProductHelpRequest request) {
+  // If we are showing the UI already, ignore the request.
+  if (media_in_product_help_)
+    return;
+
+  media_in_product_help_ = base::MakeUnique<MediaInProductHelp>(
+      render_frame_host, this, std::move(request));
+}
+
+void TabAndroid::OnMediaInProductHelpConnectionError() {
+  DCHECK(media_in_product_help_);
+  DismissMediaDownloadInProductHelp();
+}
+
 scoped_refptr<content::DevToolsAgentHost> TabAndroid::GetDevToolsAgentHost() {
   return devtools_host_;
 }