[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 94ab8cc45b04f89c0276867bc1c142168416aa00..f3f55c8c42d7fa4e6391b5c0b90e26427444b4a2 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -1623,6 +1623,11 @@ void WebViewImpl::resize(const WebSize& newSize)
 
         if (pinchVirtualViewportEnabled())
             page()->frameHost().pinchViewport().setSize(m_size);
+
+        if (page()->inspectorController().deviceEmulationEnabled()) {
+            if (Document* document = mainFrameImpl()->frame()->document())
+                document->mediaQueryAffectingValueChanged();

[ojan, 2014/06/10 02:38:05]

I can't think of a better solution, so lgtm, but this needs a comment explaining
why we need this, i.e. some version of the explanation you gave in your last
comment.

[dgozman, 2014/06/10 10:26:02]

Done.

+        }
     }
 
     if (settings()->viewportEnabled() && !m_fixedLayoutSizeLock) {