Add support for media attribute on link

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

 // Copyright 2014 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/MediaValuesDynamic.h"
 
 #include "core/css/CSSHelper.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSToLengthConversionData.h"
 #include "core/css/MediaValuesCached.h"
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 
 namespace blink {
 
 PassRefPtrWillBeRawPtr<MediaValues> MediaValuesDynamic::create(Document& document)
 {
     return MediaValuesDynamic::create(frameFrom(document));
 }
 
 PassRefPtrWillBeRawPtr<MediaValues> MediaValuesDynamic::create(LocalFrame* frame)
 {
     if (!frame || !frame->view() || !frame->document() || !frame->document()->layoutView())
         return MediaValuesCached::create();
     return adoptRefWillBeNoop(new MediaValuesDynamic(frame));
 }
 
 MediaValuesDynamic::MediaValuesDynamic(LocalFrame* frame)
     : m_frame(frame)
+    , m_viewportDimensionsOverridden(false)
+    , m_viewportWidthOverride(0)
+    , m_viewportHeightOverride(0)
+{
+    ASSERT(m_frame);
+}
+
+MediaValuesDynamic::MediaValuesDynamic(LocalFrame* frame, bool overriddenViewportDimensions, double viewportWidth, double viewportHeight)
+    : m_frame(frame)
+    , m_viewportDimensionsOverridden(overriddenViewportDimensions)
+    , m_viewportWidthOverride(viewportWidth)
+    , m_viewportHeightOverride(viewportHeight)
 {
     ASSERT(m_frame);
 }
 
 PassRefPtrWillBeRawPtr<MediaValues> MediaValuesDynamic::copy() const
 {
-    return adoptRefWillBeNoop(new MediaValuesDynamic(m_frame));
+    return adoptRefWillBeNoop(new MediaValuesDynamic(m_frame, m_viewportDimensionsOverridden, m_viewportWidthOverride, m_viewportHeightOverride));
 }
 
 bool MediaValuesDynamic::computeLength(double value, CSSPrimitiveValue::UnitType type, int& result) const
 {
     return MediaValues::computeLength(value,
         type,
         calculateDefaultFontSize(m_frame),
         calculateViewportWidth(m_frame),
         calculateViewportHeight(m_frame),
         result);
 }
 
 bool MediaValuesDynamic::computeLength(double value, CSSPrimitiveValue::UnitType type, double& result) const
 {
     return MediaValues::computeLength(value,
         type,
         calculateDefaultFontSize(m_frame),
         calculateViewportWidth(m_frame),
         calculateViewportHeight(m_frame),
         result);
 }
 
 double MediaValuesDynamic::viewportWidth() const
 {
+    if (m_viewportDimensionsOverridden)
+        return m_viewportWidthOverride;
     return calculateViewportWidth(m_frame);
 }
 
 double MediaValuesDynamic::viewportHeight() const
 {
+    if (m_viewportDimensionsOverridden)
+        return m_viewportHeightOverride;
     return calculateViewportHeight(m_frame);
 }
 
 int MediaValuesDynamic::deviceWidth() const
 {
     return calculateDeviceWidth(m_frame);
 }
 
 int MediaValuesDynamic::deviceHeight() const
 {
@@ skipping 64 matching lines @@
 {
     return m_frame;
 }
 
 DEFINE_TRACE(MediaValuesDynamic)
 {
     visitor->trace(m_frame);
     MediaValues::trace(visitor);
 }
 
+void MediaValuesDynamic::overrideViewportDimensions(double width, double height)
+{
+    m_viewportDimensionsOverridden = true;
+    m_viewportWidthOverride = width;
+    m_viewportHeightOverride = height;
+}
+
 } // namespace blink