Refactor viewport initialization logic out of WebViewImpl.

Source/core/dom/ViewportAttributes.h

 /*
  * Copyright (C) 2013 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 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef AnimationEffect_h
-#define AnimationEffect_h
+#ifndef ViewportAttributes_h
+#define ViewportAttributes_h
 
-#include <wtf/PassRefPtr.h>
-#include <wtf/RefCounted.h>
+#include "core/platform/graphics/FloatSize.h"
 
 namespace WebCore {
 
-class StylePropertySet;
+struct ViewportAttributes {
+    FloatSize layoutSize;
 
-class AnimationEffect : public RefCounted<AnimationEffect> {
+    float initialScale;
+    float minimumScale;
+    float maximumScale;
 
-public:
-    static PassRefPtr<AnimationEffect> create();
+    ViewportAttributes();
+    ViewportAttributes(float initial, float minimum, float maximum);
 
-    PassRefPtr<StylePropertySet> sample(double fraction, int iteration);
+    void overrideWith(const ViewportAttributes& other);
+    float clampToConstraints(float pageScaleFactor) const;
+    void clampAll();
 
-private:
-    AnimationEffect();
+    bool operator==(const ViewportAttributes& other) const;
 };
 
 } // namespace WebCore
 
-#endif // AnimationEffect_h
+#endif // ViewportArguments_h