Implement MediaValues for initial viewport.

third_party/WebKit/Source/core/css/MediaValuesInitialViewport.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/css/MediaValuesInitialViewport.h"
+
+#include "core/dom/Document.h"
+#include "core/frame/FrameView.h"
+#include "core/frame/LocalFrame.h"
+#include "core/layout/api/LayoutViewItem.h"
+
+namespace blink {
+
+MediaValues* MediaValuesInitialViewport::create(LocalFrame& frame) {
+  return new MediaValuesInitialViewport(frame);
+}
+
+MediaValuesInitialViewport::MediaValuesInitialViewport(LocalFrame& frame)
+    : MediaValuesDynamic(&frame) {}
+
+double MediaValuesInitialViewport::viewportWidth() const {
+  DCHECK(m_frame->view() && m_frame->document());
+  int viewportWidth = m_frame->view()->frameRect().width();
+  return adjustDoubleForAbsoluteZoom(
+      viewportWidth, m_frame->document()->layoutViewItem().styleRef());
+}
+
+double MediaValuesInitialViewport::viewportHeight() const {
+  DCHECK(m_frame->view() && m_frame->document());
+  int viewportHeight = m_frame->view()->frameRect().height();
+  return adjustDoubleForAbsoluteZoom(
+      viewportHeight, m_frame->document()->layoutViewItem().styleRef());
+}
+
+}  // namespace blink