Refactor viewport initialization logic out of WebViewImpl.

Source/core/dom/ViewportAttributes.h

Index: Source/core/dom/ViewportAttributes.h
diff --git a/Source/core/animation/AnimationEffect.h b/Source/core/dom/ViewportAttributes.h
similarity index 74%
copy from Source/core/animation/AnimationEffect.h
copy to Source/core/dom/ViewportAttributes.h
index 68c9497b5046e4512888dd3b156df8feff3f4ee1..82800bc1e87be1c8e2c1c7dfb0f1ded64d0ba534 100644
--- a/Source/core/animation/AnimationEffect.h
+++ b/Source/core/dom/ViewportAttributes.h
@@ -28,27 +28,30 @@
  * 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;

[kenneth.r.christiansen, 2013/05/13 11:00:18]

Maybe we should start  following the CSS Device Adapt spec and call these zoom,
minZoom, maxZoom instead? ViewportArguments already follow that nomenclature

[aelias_OOO_until_Jul13, 2013/05/13 18:13:06]

I disagree, the term "zoom" is overloaded and generally used to refer to Ctrl-+
style zoom in Blink.  I've been following the convention to call
viewport-tag/pinch "scale" and if anything would prefer to switch
ViewportArguments to say "scale".

+    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