Allow default font size changing on Linux.

Source/web/linux/WebFontRendering.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "public/web/linux/WebFontRendering.h"
 
+#include "core/rendering/RenderThemeChromiumFontProvider.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/FontPlatformData.h"
 
 using blink::FontDescription;
 using blink::FontPlatformData;
 
 namespace blink {
 
 // static
 void WebFontRendering::setHinting(SkPaint::Hinting hinting)
@@ skipping 36 matching lines @@
 {
     SkFontHost::SetSubpixelOrder(order);
 }
 
 // static
 void WebFontRendering::setLCDOrientation(SkFontHost::LCDOrientation orientation)
 {
     SkFontHost::SetSubpixelOrientation(orientation);
 }
 
+// static
+void WebFontRendering::setDefaultFontSize(int size)
+{
+    RenderThemeChromiumFontProvider::setDefaultFontSize(size);
+}
+
 } // namespace blink