Add support for sending touch events in DRT.

As part of this, make it possible for DRT to configure the timeout threshold between sending touch events to WebCore as the Layout Tests only synthesize single events, not a stream. Because of this, they often get dropped by the WebView for coming too quickly.

Skip the multi touch test as we don't support multi touch in the Browser.

Change-Id: I7b9830f43181fea33206825b49ef2e294269b4dd

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

@@ -705,6 +705,7 @@ public class TestShellActivity extends Activity implements LayoutTestController
         mDumpDatabaseCallbacks = false;
         mCanOpenWindows = false;
         mEventSender.resetMouse();
+        mEventSender.clearTouchPoints();
         mPageFinished = false;
         mOneHundredPercentComplete = false;
         mDumpWebKitData = false;
@@ -769,6 +770,12 @@ public class TestShellActivity extends Activity implements LayoutTestController
 
         webview.setWebChromeClient(mChromeClient);
         webview.setWebViewClient(mViewClient);
+        // Setting a touch interval of -1 effectively disables the optimisation in WebView
+        // that stops repeated touch events flooding WebCore. The Event Sender only sends a
+        // single event rather than a stream of events (like what would generally happen in
+        // a real use of touch events in a WebView)  and so if the WebView drops the event,
+        // the test will fail as the test expects one callback for every touch it synthesizes.
+        webview.setTouchInterval(-1);
     }
 
     private WebView mWebView;