Move MessagePort implementation from android_webview to content

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index bec107a0310158510676507e8e07a6a9e10b3284..53284fa2295b016552d0a856fe5587e31e7b296e 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -101,6 +101,7 @@
 #include "url/gurl.h"
 
 #if defined(OS_ANDROID)
+#include "content/browser/android/app_web_message_port_message_filter.h"
 #include "content/public/browser/android/java_interfaces.h"
 #if defined(ENABLE_MOJO_CDM)
 #include "content/browser/media/android/provision_fetcher_impl.h"
@@ -528,6 +529,18 @@ RenderFrameHostImpl::GetRemoteAssociatedInterfaces() {
   return remote_associated_interfaces_.get();
 }
 
+#if defined(OS_ANDROID)
+scoped_refptr<AppWebMessagePortMessageFilter>
+RenderFrameHostImpl::GetAppWebMessagePortMessageFilter(int routing_id) {
+  if (!app_web_message_port_message_filter_) {
+    app_web_message_port_message_filter_ =
+        new AppWebMessagePortMessageFilter(routing_id);
+    GetProcess()->AddFilter(app_web_message_port_message_filter_.get());
+  }
+  return app_web_message_port_message_filter_;
+}
+#endif
+
 blink::WebPageVisibilityState RenderFrameHostImpl::GetVisibilityState() {
   // Works around the crashes seen in https://crbug.com/501863, where the
   // active WebContents from a browser iterator may contain a render frame