[android_webview] Use a MotionEvent to trigger ShouldInterceptRequest tests.

android_webview/javatests/src/org/chromium/android_webview/test/util/AwTestTouchUtils.java

Index: android_webview/javatests/src/org/chromium/android_webview/test/util/AwTestTouchUtils.java
diff --git a/android_webview/javatests/src/org/chromium/android_webview/test/util/AwTestTouchUtils.java b/android_webview/javatests/src/org/chromium/android_webview/test/util/AwTestTouchUtils.java
index 2c83e43163abddfd6ce1574efb1123800a279abe..bdae4ec3bf84a655b25184fae4ba2e65cd586777 100644
--- a/android_webview/javatests/src/org/chromium/android_webview/test/util/AwTestTouchUtils.java
+++ b/android_webview/javatests/src/org/chromium/android_webview/test/util/AwTestTouchUtils.java
@@ -76,5 +76,29 @@ public class AwTestTouchUtils {
             }
         });
     }
+
+    /**
+     * Performs a single touch on the center of the supplied view.
+     * This is safe to call from the instrumentation thread and will invoke the touch
+     * asynchronously.
+     *
+     * @param view The view the coordinates are relative to.
+     */
+    public static void simulateTouchCenterOfView(final View view) throws Throwable {
+        view.post(new Runnable() {
+            @Override
+            public void run() {
+                long eventTime = SystemClock.uptimeMillis();
+                float x = (float) (view.getRight() - view.getLeft()) / 2;
+                float y = (float) (view.getBottom() - view.getTop()) / 2;
+                view.onTouchEvent(MotionEvent.obtain(
+                        eventTime, eventTime, MotionEvent.ACTION_DOWN,
+                        x, y, 0));
+                view.onTouchEvent(MotionEvent.obtain(
+                        eventTime, eventTime, MotionEvent.ACTION_UP,
+                        x, y, 0));
+            }
+        });
+    }
 }