Don't bother layout until first navigation is done.

third_party/WebKit/Source/web/tests/DocumentLoadingRenderingTest.cpp

Index: third_party/WebKit/Source/web/tests/DocumentLoadingRenderingTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/DocumentLoadingRenderingTest.cpp b/third_party/WebKit/Source/web/tests/DocumentLoadingRenderingTest.cpp
index db54b4ac706c7fb35be0bdb33f05bf7093fa3e6c..cc69fe6b751b0afcf69e98eaed069e6203efa7de 100644
--- a/third_party/WebKit/Source/web/tests/DocumentLoadingRenderingTest.cpp
+++ b/third_party/WebKit/Source/web/tests/DocumentLoadingRenderingTest.cpp
@@ -291,4 +291,22 @@ TEST_F(DocumentLoadingRenderingTest, ShouldNotPaintIframeContentWithPendingSheet
     EXPECT_TRUE(frame3.containsText());
 }
 
+TEST_F(DocumentLoadingRenderingTest, ShouldNotLayoutBeforeNavigation)
+{
+    EXPECT_TRUE(compositor().deferCommits());
+    EXPECT_FALSE(hadFirstLayout());
+
+    // Blink embedder may resize the WebView before navigation, but it shouldn't
+    // trigger empty layout.
+    webView().resize(WebSize(800, 600));
+    EXPECT_TRUE(compositor().deferCommits());
+    EXPECT_FALSE(hadFirstLayout());
+
+    // Blink embedder may set focus on the WebView before navigation,
+    // but it shouldn't trigger empty layout.
+    webView().setFocus(true);
+    EXPECT_TRUE(compositor().deferCommits());
+    EXPECT_FALSE(hadFirstLayout());
+}
+
 } // namespace blink