Refactor viewport initialization logic out of WebViewImpl.

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 884 matching lines @@
 String Internals::configurationForViewport(Document* document, float devicePixelRatio, int deviceWidth, int deviceHeight, int availableWidth, int availableHeight, ExceptionCode& ec)
 {
     if (!document || !document->page()) {
         ec = INVALID_ACCESS_ERR;
         return String();
     }
     Page* page = document->page();
 
     const int defaultLayoutWidthForNonMobilePages = 980;
 
+    // FIXME(aelias): Remove this argument from all the fast/viewport tests.
+    ASSERT(devicePixelRatio == 1);
+
     ViewportArguments arguments = page->viewportArguments();
-    ViewportAttributes attributes = computeViewportAttributes(arguments, defaultLayoutWidthForNonMobilePages, deviceWidth, deviceHeight, devicePixelRatio, IntSize(availableWidth, availableHeight));
-    restrictMinimumScaleFactorToViewportSize(attributes, IntSize(availableWidth, availableHeight), devicePixelRatio);
-    restrictScaleFactorToInitialScaleIfNotUserScalable(attributes);
+    PageScaleConstraints constraints = arguments.resolve(IntSize(availableWidth, availableHeight), FloatSize(deviceWidth, deviceHeight), defaultLayoutWidthForNonMobilePages);
+    constraints.fitToContentsWidth(constraints.layoutSize.width(), availableWidth);
 
-    return "viewport size " + String::number(attributes.layoutSize.width()) + "x" + String::number(attributes.layoutSize.height()) + " scale " + String::number(attributes.initialScale) + " with limits [" + String::number(attributes.minimumScale) + ", " + String::number(attributes.maximumScale) + "] and userScalable " + (attributes.userScalable ? "true" : "false");
+    return "viewport size " + String::number(constraints.layoutSize.width()) + "x" + String::number(constraints.layoutSize.height()) + " scale " + String::number(constraints.initialScale) + " with limits [" + String::number(constraints.minimumScale) + ", " + String::number(constraints.maximumScale) + "] and userScalable " + (arguments.userZoom ? "true" : "false");
 }
 
 bool Internals::wasLastChangeUserEdit(Element* textField, ExceptionCode& ec)
 {
     if (!textField) {
         ec = INVALID_ACCESS_ERR;
         return false;
     }
 
     if (HTMLInputElement* inputElement = textField->toInputElement())
@@ skipping 1013 matching lines @@
 
     RenderObject* renderer = select->renderer();
     if (!renderer->isMenuList())
         return false;
 
     RenderMenuList* menuList = toRenderMenuList(renderer);
     return menuList->popupIsVisible();
 }
 
 }