Hook up test runner to new layout_test_html_viewer

components/html_viewer/html_document.h

Index: components/html_viewer/html_document.h
diff --git a/components/html_viewer/html_document.h b/components/html_viewer/html_document.h
index 7ee1604be1de3c5dd33120d78cf6f6ddb9816b3e..60fe35f2cd19d41591e7f7903f3df7cd05b31ff5 100644
--- a/components/html_viewer/html_document.h
+++ b/components/html_viewer/html_document.h
@@ -81,21 +81,11 @@ class HTMLDocument : public blink::WebViewClient,
   // Deletes this object.
   void Destroy();
 
- private:
-  // Data associated with a child iframe.
-  struct ChildFrameData {
-    mojo::View* view;
-    blink::WebTreeScopeType scope;
-  };
+  blink::WebView* web_view() const { return web_view_; }
 
+ protected:
   ~HTMLDocument() override;
 
-  // Updates the size and scale factor of the webview and related classes from
-  // |root_|.
-  void UpdateWebviewSizeFromViewSize();
-
-  void InitGlobalStateAndLoadIfNecessary();
-
   // WebViewClient methods:
   virtual blink::WebStorageNamespace* createSessionStorageNamespace();
 
@@ -130,6 +120,19 @@ class HTMLDocument : public blink::WebViewClient,
                                      blink::WebHistoryCommitType commit_type);
   virtual blink::WebEncryptedMediaClient* encryptedMediaClient();
 
+ private:
+  // Data associated with a child iframe.
+  struct ChildFrameData {
+    mojo::View* view;
+    blink::WebTreeScopeType scope;
+  };
+
+  // Updates the size and scale factor of the webview and related classes from
+  // |root_|.
+  void UpdateWebviewSizeFromViewSize();
+
+  void InitGlobalStateAndLoadIfNecessary();
+
   // ViewManagerDelegate methods:
   void OnEmbed(mojo::View* root) override;
   void OnViewManagerDestroyed(mojo::ViewManager* view_manager) override;