Add layout test for select line breaking.

git-svn-id: svn://svn.chromium.org/blink/trunk@18852 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/fast/replaced/three-selects-break-expected.checksum

+079f117f442465e4114c5df207a074ee
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third_party/WebKit/LayoutTests/fast/replaced/three-selects-break-expected.txt

+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x600
+  RenderBlock {HTML} at (0,0) size 800x600
+    RenderBody {BODY} at (8,8) size 784x584
+      RenderBlock {DIV} at (0,0) size 5x66
+        RenderMenuList {SELECT} at (2,2) size 36x18 [bgcolor=#FFFFFF]
+        RenderMenuList {SELECT} at (2,24) size 36x18 [bgcolor=#FFFFFF]
+        RenderMenuList {SELECT} at (2,46) size 36x18 [bgcolor=#FFFFFF]

third_party/WebKit/LayoutTests/fast/replaced/three-selects-break.html

+<div style="width:
+5px"><select></select><select></select><select></select></div>
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