diff --git a/engine/src/flutter/shell/ui/animator.cc b/engine/src/flutter/shell/ui/animator.cc
index e7f299b97c9..0833259c65d 100644
--- a/engine/src/flutter/shell/ui/animator.cc
+++ b/engine/src/flutter/shell/ui/animator.cc
@@ -34,9 +34,17 @@ void Animator::RequestFrame() {
   }
 }
 
+void Animator::CancelFrameRequest() {
+  engine_requested_frame_ = false;
+}
+
 void Animator::BeginFrame() {
   DCHECK(frame_in_progress_);
-  DCHECK(engine_requested_frame_);
+  // There could be a request in the message loop at time of cancel.
+  if (!engine_requested_frame_) {
+    frame_in_progress_ = false;
+    return;
+  }
   engine_requested_frame_ = false;
 
   engine_->BeginFrame(base::TimeTicks::Now());
diff --git a/engine/src/flutter/shell/ui/animator.h b/engine/src/flutter/shell/ui/animator.h
index 764302541f8..15dd2f43f2e 100644
--- a/engine/src/flutter/shell/ui/animator.h
+++ b/engine/src/flutter/shell/ui/animator.h
@@ -17,6 +17,7 @@ class Animator {
   ~Animator();
 
   void RequestFrame();
+  void CancelFrameRequest();
 
  private:
   void BeginFrame();
diff --git a/engine/src/flutter/shell/ui/engine.cc b/engine/src/flutter/shell/ui/engine.cc
index e8b6560e8ac..9333a41562f 100644
--- a/engine/src/flutter/shell/ui/engine.cc
+++ b/engine/src/flutter/shell/ui/engine.cc
@@ -119,13 +119,21 @@ void Engine::OnInputEvent(InputEventPtr event) {
 }
 
 void Engine::LoadURL(const mojo::String& url) {
-  web_view_ = blink::WebView::create(this);
+  // Something bad happens if you try to call WebView::close and replace
+  // the webview.  So for now we just load into the existing one. :/
+  if (!web_view_)
+    web_view_ = blink::WebView::create(this);
   ConfigureSettings(web_view_->settings());
   web_view_->setMainFrame(blink::WebLocalFrame::create(this));
   UpdateWebViewSize();
   web_view_->mainFrame()->load(GURL(url));
 }
 
+void Engine::frameDetached(blink::WebFrame* frame) {
+  // |frame| is invalid after here.
+  frame->close();
+}
+
 void Engine::initializeLayerTreeView() {
 }
 
@@ -133,5 +141,23 @@ void Engine::scheduleVisualUpdate() {
   animator_->RequestFrame();
 }
 
+blink::ServiceProvider* Engine::services() {
+  return this;
+}
+
+mojo::NavigatorHost* Engine::NavigatorHost() {
+  return this;
+}
+
+void Engine::RequestNavigate(mojo::Target target,
+                             mojo::URLRequestPtr request) {
+  // Ignoring target for now.
+  base::MessageLoop::current()->PostTask(FROM_HERE,
+      base::Bind(&Engine::LoadURL, GetWeakPtr(), request->url));
+}
+
+void Engine::DidNavigateLocally(const mojo::String& url) {
+}
+
 }  // namespace shell
 }  // namespace sky
diff --git a/engine/src/flutter/shell/ui/engine.h b/engine/src/flutter/shell/ui/engine.h
index dfec785c63f..004050e06f5 100644
--- a/engine/src/flutter/shell/ui/engine.h
+++ b/engine/src/flutter/shell/ui/engine.h
@@ -11,7 +11,9 @@
 #include "base/single_thread_task_runner.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/system/core.h"
+#include "mojo/services/navigation/public/interfaces/navigation.mojom.h"
 #include "skia/ext/refptr.h"
+#include "sky/engine/public/platform/ServiceProvider.h"
 #include "sky/engine/public/web/WebFrameClient.h"
 #include "sky/engine/public/web/WebViewClient.h"
 #include "sky/shell/gpu_delegate.h"
@@ -26,6 +28,8 @@ class Animator;
 
 class Engine : public UIDelegate,
                public ViewportObserver,
+               public blink::ServiceProvider,
+               public mojo::NavigatorHost,
                public blink::WebFrameClient,
                public blink::WebViewClient {
  public:
@@ -56,9 +60,19 @@ class Engine : public UIDelegate,
   void LoadURL(const mojo::String& url) override;
 
   // WebViewClient methods:
+  void frameDetached(blink::WebFrame*) override;
   void initializeLayerTreeView() override;
   void scheduleVisualUpdate() override;
   blink::WebScreenInfo screenInfo() override;
+  blink::ServiceProvider* services() override;
+
+  // Services methods:
+  mojo::NavigatorHost* NavigatorHost() override;
+
+  // NavigatorHost methods:
+  void RequestNavigate(mojo::Target target,
+                       mojo::URLRequestPtr request) override;
+  void DidNavigateLocally(const mojo::String& url) override;
 
   void UpdateWebViewSize();