Move deferred commit logic from WebViewImpl to Document.

third_party/WebKit/Source/core/dom/Document.h

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 168234fa5dfd638168732033782af8322d50539c..1279d364571d49093810d99329aa2f00901f1000 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -757,6 +757,7 @@ public:
     HTMLBodyElement* firstBodyElement() const;
 
     void setBody(HTMLElement*, ExceptionState&);
+    void willInsertBody();
 
     HTMLHeadElement* head() const;
 
@@ -1110,6 +1111,8 @@ private:
 
     void detachParser();
 
+    void beginLifecycleUpdatesIfRenderingReady();
+
     bool isDocument() const final { return true; }
 
     void childrenChanged(const ChildrenChange&) override;