Don't ignore size updates that have a width and height == 0.

Source/web/tests/WebFrameTest.cpp

Index: Source/web/tests/WebFrameTest.cpp
diff --git a/Source/web/tests/WebFrameTest.cpp b/Source/web/tests/WebFrameTest.cpp
index 1523c1924311e94892cb5864f555091a7ff0c39f..017149902098048b652546d8509e595ec2692c53 100644
--- a/Source/web/tests/WebFrameTest.cpp
+++ b/Source/web/tests/WebFrameTest.cpp
@@ -859,6 +859,23 @@ TEST_F(WebFrameTest, DisablingFixedLayoutSizeSetsCorrectLayoutSize)
     EXPECT_EQ(980, webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->contentsSize().width());
 }
 
+TEST_F(WebFrameTest, ZeroHeightPositiveWidthNotIgnored)
+{
+    UseMockScrollbarSettings mockScrollbarSettings;
+
+    FixedLayoutTestWebViewClient client;
+    client.m_screenInfo.deviceScaleFactor = 1;
+    int viewportWidth = 1280;
+    int viewportHeight = 0;
+
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    webViewHelper.initialize(true, 0, &client, enableViewportSettings);
+    webViewHelper.webView()->resize(WebSize(viewportWidth, viewportHeight));
+
+    EXPECT_EQ(viewportWidth, webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->layoutSize().width());
+    EXPECT_EQ(viewportHeight, webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->layoutSize().height());
+}
+
 TEST_F(WebFrameTest, DeviceScaleFactorUsesDefaultWithoutViewportTag)
 {
     UseMockScrollbarSettings mockScrollbarSettings;