Avoid clobbering state in viewport tag initialization.

third_party/WebKit/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 1502 matching lines @@
     EXPECT_FALSE(webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->needsLayout());
     EXPECT_EQ(0, webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->layoutSize().height());
 
     webViewHelper.resize(WebSize(viewportWidth * 2, viewportHeight));
     EXPECT_EQ(0, webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->layoutSize().height());
 
     webViewHelper.webView()->settings()->setForceZeroLayoutHeight(false);
     EXPECT_LE(viewportHeight, webViewHelper.webViewImpl()->mainFrameImpl()->frameView()->layoutSize().height());
 }
 
+TEST_F(WebFrameTest, ToggleViewportMetaOnOff)
+{
+    registerMockedHttpURLLoad("viewport-device-width.html");
+
+    FixedLayoutTestWebViewClient client;
+    client.m_screenInfo.deviceScaleFactor = 1;
+    int viewportWidth = 640;
+    int viewportHeight = 480;
+
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    webViewHelper.initializeAndLoad(m_baseURL + "viewport-device-width.html", true, 0, &client);
+    WebSettings* settings = webViewHelper.webView()->settings();
+    settings->setViewportMetaEnabled(false);
+    settings->setViewportEnabled(true);
+    settings->setMainFrameResizesAreOrientationChanges(true);
+    settings->setShrinksViewportContentToFit(true);
+    webViewHelper.resize(WebSize(viewportWidth, viewportHeight));
+
+    Document* document = toLocalFrame(webViewHelper.webViewImpl()->page()->mainFrame())->document();
+    EXPECT_FALSE(document->viewportDescription().isLegacyViewportType());
+
+    settings->setViewportMetaEnabled(true);
+    EXPECT_TRUE(document->viewportDescription().isLegacyViewportType());
+
+    settings->setViewportMetaEnabled(false);
+    EXPECT_FALSE(document->viewportDescription().isLegacyViewportType());
+}
+
 TEST_F(WebFrameTest, SetForceZeroLayoutHeightWorksWithRelayoutsWhenHeightChanged)
 {
     // this unit test is an attempt to target a real world case where an app could
     // 1. call resize(width, 0) and setForceZeroLayoutHeight(true)
     // 2. load content (hoping that the viewport height would increase
     // as more content is added)
     // 3. fail to register touch events aimed at the loaded content
     // because the layout is only updated if either width or height is changed
     registerMockedHttpURLLoad("button.html");
 
@@ skipping 7022 matching lines @@
     WebLocalFrame* mainFrame = helper.webView()->mainFrame()->toWebLocalFrame();
     v8::HandleScope scope(v8::Isolate::GetCurrent());
     mainFrame->executeScript(WebScriptSource("hello = 'world';"));
     FrameTestHelpers::loadFrame(mainFrame, "data:text/html,new page");
     v8::Local<v8::Value> result = mainFrame->executeScriptAndReturnValue(WebScriptSource("hello"));
     ASSERT_TRUE(result->IsString());
     EXPECT_EQ("world", toCoreString(result->ToString(mainFrame->mainWorldScriptContext()).ToLocalChecked()));
 }
 
 } // namespace blink