Add a few reftests for native theme drawing.

layout/reftests/native-theme/button-html-not-blank.html

@@ -0,0 +1 @@
+<button></button>

layout/reftests/native-theme/button-not-blank.html

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+<input type="button">

layout/reftests/native-theme/checkbox-not-blank.html

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+<input type="checkbox">

layout/reftests/native-theme/combobox-not-blank.html

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+<select size="1"></select>

layout/reftests/native-theme/fieldset-not-blank.html

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+<fieldset></fieldset>

layout/reftests/native-theme/file-not-blank.html

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+<input type="file">

layout/reftests/native-theme/listbox-not-blank.html

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+<select size="3"></select>

layout/reftests/native-theme/radio-not-blank.html

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+<input type="radio">

layout/reftests/native-theme/reftest.list

@@ -0,0 +1,10 @@
+fails-if(MOZ_WIDGET_TOOLKIT=="cocoa") != button-html-not-blank.html about:blank # bug 382048
+fails-if(MOZ_WIDGET_TOOLKIT=="cocoa") != button-not-blank.html about:blank # bug 382048
+!= checkbox-not-blank.html about:blank
+!= combobox-not-blank.html about:blank
+!= fieldset-not-blank.html about:blank
+!= file-not-blank.html about:blank
+!= listbox-not-blank.html about:blank
+!= radio-not-blank.html about:blank
+!= text-control-not-blank.html about:blank
+!= textarea-not-blank.html about:blank

layout/reftests/native-theme/text-control-not-blank.html

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+<input type="text">

layout/reftests/native-theme/textarea-not-blank.html

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+<textarea rows="5" cols="40"></textarea>

layout/reftests/reftest.list

@@ -92,3 +92,6 @@ include text-indent/reftest.list
 
 # text-transform/
 include text-transform/reftest.list
+
+# native-theme/
+include native-theme/reftest.list