[DevTools] Update media queries when resizing with emulation on.

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 51c45460b378c2f15239fceba6f3b17969307127..0f8af0913004786143820c8fcd6dbee1a94d463f 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -1621,6 +1621,15 @@ void WebViewImpl::resize(const WebSize& newSize)
 
         if (pinchVirtualViewportEnabled())
             page()->frameHost().pinchViewport().setSize(m_size);
+
+        // When device emulation is enabled, device size values may change - they are
+        // usually set equal to the view size. These values are not considered viewport-dependent
+        // (see MediaQueryExp::isViewportDependent), and will not be invalidated in |FrameView::performPreLayoutTasks|.

[ojan, 2014/06/10 17:22:37]

I would add something like...

These values are not considered viewport-dependent since they are only
viewport-dependent in emulation mode...

[dgozman, 2014/06/18 13:15:43]

Done.

+        // Therefore we should force explicit media queries invalidation here.
+        if (page()->inspectorController().deviceEmulationEnabled()) {
+            if (Document* document = mainFrameImpl()->frame()->document())
+                document->mediaQueryAffectingValueChanged();
+        }
     }
 
     if (settings()->viewportEnabled() && !m_fixedLayoutSizeLock) {