[Presentation API] (alternative) 1-UA: send message between controller and receiver page

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 3aa2a4911fc341c8d7a1419ae4bf1baa40d28227..bceedf7315132651425f69aa7df0b8ceabf639ff 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -109,6 +109,7 @@ class BrowserPluginGuestDelegate;
 class BrowserPpapiHost;
 class BrowserURLHandler;
 class ClientCertificateDelegate;
+class ControllerPresentationServiceDelegate;
 class DevToolsManagerDelegate;
 class ExternalVideoSurfaceContainer;
 class GpuProcessHost;
@@ -118,8 +119,8 @@ class MemoryCoordinatorDelegate;
 class NavigationHandle;
 class NavigationUIData;
 class PlatformNotificationService;
-class PresentationServiceDelegate;
 class QuotaPermissionContext;
+class ReceiverPresentationServiceDelegate;
 class RenderFrameHost;
 class RenderProcessHost;
 class RenderViewHost;
@@ -708,10 +709,15 @@ class CONTENT_EXPORT ContentBrowserClient {
       RenderFrameHost* render_frame_host,
       blink::WebPageVisibilityState* visibility_state) {}
 
-  // Allows an embedder to provide its own PresentationServiceDelegate
+  // Allows an embedder to provide its own ControllerPresentationServiceDelegate
   // implementation. Returns nullptr if unavailable.
-  virtual PresentationServiceDelegate* GetPresentationServiceDelegate(
-      WebContents* web_contents);
+  virtual ControllerPresentationServiceDelegate*
+  GetControllerPresentationServiceDelegate(WebContents* web_contents);
+
+  // Allows an embedder to provide its own ReceiverPresentationServiceDelegate
+  // implementation. Returns nullptr if unavailable.
+  virtual ReceiverPresentationServiceDelegate*
+  GetReceiverPresentationServiceDelegate(WebContents* web_contents);
 
   // Allows programmatic opening of a new tab/window without going through
   // another WebContents. For example, from a Worker. |callback| will be