Follow ARIA spec guidelines for role=button with aria-pressed.

webkit/glue/webkit_strings.grd

Index: webkit/glue/webkit_strings.grd
diff --git a/webkit/glue/webkit_strings.grd b/webkit/glue/webkit_strings.grd
index 949d04d4cacec808854c75b4b45027443de9a623..ca73373fd70ebbcd05aa7320d064aef2fae37fcc 100644
--- a/webkit/glue/webkit_strings.grd
+++ b/webkit/glue/webkit_strings.grd
@@ -30,7 +30,7 @@ below:
  * 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. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

[jamesr, 2014/03/06 05:53:58]

this seems unrelated

[aboxhall, 2014/03/06 15:21:04]

Yeah, my editor is configured to strip trailing whitespace on save. Is it a
problem if I leave this in, or should I go fix it?

  */
 -->
 
@@ -347,6 +347,9 @@ below:
       <message name="IDS_AX_ROLE_STEPPER" desc="accessibility role description for a stepper - a control where you can use up/down arrows to increment or decrement it. The name 'stepper' is how this user interface element is described by VoiceOver on Mac OS X; the translation should be consistent with VoiceOver.">
         stepper
       </message>
+      <message name="IDS_AX_ROLE_TOGGLE_BUTTON" desc="accessibility role description for a toggle button">
+        toggle button
+      </message>
 
       <message name="IDS_AX_BUTTON_ACTION_VERB" desc="Verb stating the action that will occur when a button is pressed, as used by accessibility.">
         press