Pass key modifier state to webcore for touch events and update DRT so it can simulate them.

Change-Id: Ic5aa8cb0376f6a3eecaa6340d57f28fa97f016bd

tests/DumpRenderTree/src/com/android/dumprendertree/TestShellActivity.java

@@ -716,6 +716,7 @@ public class TestShellActivity extends Activity implements LayoutTestController
         mCanOpenWindows = false;
         mEventSender.resetMouse();
         mEventSender.clearTouchPoints();
+        mEventSender.clearTouchMetaState();
         mPageFinished = false;
         mOneHundredPercentComplete = false;
         mDumpWebKitData = false;