Need to clear viewport dependent units switching print mode.

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

 /*
  * Copyright (C) 2011, 2012 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 71 matching lines @@
 #include "public/web/WebCache.h"
 #include "public/web/WebDateTimeChooserCompletion.h"
 #include "public/web/WebDeviceEmulationParams.h"
 #include "public/web/WebDocument.h"
 #include "public/web/WebElement.h"
 #include "public/web/WebFrame.h"
 #include "public/web/WebFrameClient.h"
 #include "public/web/WebFrameContentDumper.h"
 #include "public/web/WebHitTestResult.h"
 #include "public/web/WebInputMethodController.h"
+#include "public/web/WebPrintParams.h"
 #include "public/web/WebScriptSource.h"
 #include "public/web/WebSettings.h"
 #include "public/web/WebTreeScopeType.h"
 #include "public/web/WebViewClient.h"
 #include "public/web/WebWidget.h"
 #include "public/web/WebWidgetClient.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "web/DevToolsEmulator.h"
@@ skipping 4174 matching lines @@
       .translate(-50, -55)
       .translate(50, 55)
       .scale(1. / 2.f);
   EXPECT_EQ(expectedMatrix,
             webViewImpl->getDeviceEmulationTransformForTesting());
   // visibleContentRect doesn't change.
   EXPECT_EQ(IntRect(50, 55, 50, 75),
             *devToolsEmulator->visibleContentRectForPainting());
 }
 
+TEST_P(WebViewTest, ResizeForPrintingViewportUnits) {
+  WebViewImpl* webView = m_webViewHelper.initialize();
+  webView->resize(WebSize(800, 600));
+
+  WebURL baseURL = URLTestHelpers::toKURL("http://example.com/");
+  FrameTestHelpers::loadHTMLString(webView->mainFrame(),
+                                   "<style>#vw { width: 100vw }</style>"
+                                   "<div id=vw></div>",
+                                   baseURL);
+
+  WebLocalFrameImpl* frame = webView->mainFrameImpl();
+  Document* document = frame->frame()->document();
+  Element* vwElement = document->getElementById("vw");
+
+  EXPECT_EQ(800, vwElement->offsetWidth());
+
+  WebPrintParams printParams;
+  printParams.printContentArea.width = 500;
+  printParams.printContentArea.height = 500;
+
+  frame->printBegin(printParams, WebNode());
+  webView->resize(WebSize(500, 500));
+  EXPECT_EQ(500, vwElement->offsetWidth());
+
+  webView->resize(WebSize(800, 600));
+  frame->printEnd();
+  EXPECT_EQ(800, vwElement->offsetWidth());
+}
+
 }  // namespace blink