Let page zoom affect resolution and -webkit-device-pixel-ratio MQs.

Source/core/page/Frame.cpp

Index: Source/core/page/Frame.cpp
diff --git a/Source/core/page/Frame.cpp b/Source/core/page/Frame.cpp
index 976fb169caf19f9072f1bee77d2af9430bb496ef..6fd658bbd3d43837899921f271992d0cc64e470f 100644
--- a/Source/core/page/Frame.cpp
+++ b/Source/core/page/Frame.cpp
@@ -709,4 +709,15 @@ PassOwnPtr<DragImage> Frame::dragImageForSelection()
     return DragImage::create(image.get());
 }
 
+float Frame::resolutionDPPX() const

[eae, 2013/08/14 15:20:49]

I don't like the name of this method, why not call it devicePixelRatio instead?
Also, it should use (and return) a double, not a float.

[rune, 2013/08/14 15:59:34]

OK.
If so, I'll need to clampTo<float> in the media query evaluation to avoid test
failures. I tried to use a double value return from Frame::resolutionDPPX in
combination with getDoubleValue instead of getFloatValue in evalResolution, but
that caused tests to fail. I haven't investigated it closely.

[rune, 2013/08/14 16:04:43]

Done.

+{
+    if (!m_page)
+        return 0;
+
+    float resolution = m_page->deviceScaleFactor();
+    if (RuntimeEnabledFeatures::devicePixelRatioIncludesZoomEnabled())
+        resolution *= pageZoomFactor();
+    return resolution;
+}
+
 } // namespace WebCore