Start out deferring commits in WebViewImpl.

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index 107878abf2a9750ffbc8f1fbdcf4cac5e29e5b78..ba6c6c4daf366bdd2a347419513eef581b10b3a7 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -4269,8 +4269,13 @@ void WebViewImpl::initializeLayerTreeView()
         devTools->layerTreeViewChanged(m_layerTreeView);
 
     m_page->settings().setAcceleratedCompositingEnabled(m_layerTreeView);
-    if (m_layerTreeView)
+    if (m_layerTreeView) {
         m_page->layerTreeViewInitialized(*m_layerTreeView);
+        // We don't yet have a page loaded at this point of the initialization of WebViewImpl.
+        // Suppress commits until Blink generates invalidations so we don't
+        // attempt to paint too early in the next page load.
+        m_layerTreeView->setDeferCommits(true);
+    }
 
     // FIXME: only unittests, click to play, Android printing, and printing (for headers and footers)
     // make this assert necessary. We should make them not hit this code and then delete allowsBrokenNullLayerTreeView.