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

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 841 matching lines @@
     EXPECT_TRUE(webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->needsLayout());
     webViewHelper.webView()->layout();
     EXPECT_EQ(viewportWidth, webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->contentsSize().width());
 
     webViewHelper.webView()->setFixedLayoutSize(WebSize(0, 0));
     EXPECT_TRUE(webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->needsLayout());
     webViewHelper.webView()->layout();
     EXPECT_EQ(980, webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->contentsSize().width());
 }
 
+TEST_F(WebFrameTest, ZeroHeightPositiveWidthNotIgnored)
+{
+    UseMockScrollbarSettings mockScrollbarSettings;
+
+    FixedLayoutTestWebViewClient client;
+    client.m_screenInfo.deviceScaleFactor = 1;
+    int viewportWidth = 640;
+    int viewportHeight = 0;
+
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    webViewHelper.initialize(true, 0, &client, enableViewportSettings);
+    webViewHelper.webView()->settings()->setUseWideViewport(true);

[mnaganov (inactive), 2014/02/20 15:50:25]

I think this isn't needed, as wide viewport is turned on by default. Even having
it off will not do anything unless you enable WideViewportQuirk.

[mkosiba (inactive), 2014/02/20 15:59:32]

Done.

+    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;
     registerMockedHttpURLLoad("no_viewport_tag.html");
 
     int viewportWidth = 640;
     int viewportHeight = 480;
 
     FixedLayoutTestWebViewClient client;
     client.m_screenInfo.deviceScaleFactor = 2;
@@ skipping 4250 matching lines @@
     // Will scale the page by 1.5.
     webView->resize(WebSize(300, 330));
     webView->layout();
     EXPECT_EQ(220, bottomFixed->offsetTop() + bottomFixed->offsetHeight());
     EXPECT_EQ(220, topBottomFixed->offsetHeight());
     EXPECT_EQ(200, rightFixed->offsetLeft() + rightFixed->offsetWidth());
     EXPECT_EQ(200, leftRightFixed->offsetWidth());
 }
 
 } // namespace