Add support for reposting the ET_GESTURE_TAP_DOWN gesture event to the RootWindow and in the

ui/aura/root_window_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/root_window.h"
 
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/aura/client/event_client.h"
@@ skipping 864 matching lines @@
 
   // Tap on w2 which triggers nested gestures for w1.
   test::EventGenerator generator(root_window(), w2.get());
   generator.GestureTapAt(w2->bounds().CenterPoint());
 
   // Both windows should get their gesture end events.
   EXPECT_EQ(1, d1.gesture_end_count());
   EXPECT_EQ(1, d2.gesture_end_count());
 }
 
+// Tests whether we can repost the Tap down gesture event.
+TEST_F(RootWindowTest, RepostTapdownGestureTest) {
+  EventFilterRecorder* filter = new EventFilterRecorder;
+  root_window()->SetEventFilter(filter);  // passes ownership
+
+  test::TestWindowDelegate delegate;
+  scoped_ptr<aura::Window> window(CreateTestWindowWithDelegate(
+      &delegate, 1, gfx::Rect(0, 0, 100, 100), root_window()));
+
+  ui::GestureEventDetails details(ui::ET_GESTURE_TAP_DOWN, 0.0f, 0.0f);
+  gfx::Point point(10, 10);
+  ui::GestureEvent event(
+      ui::ET_GESTURE_TAP_DOWN,
+      point.x(),
+      point.y(),
+      0,
+      ui::EventTimeForNow(),
+      details,
+      0);
+  root_window()->RepostEvent(event);
+  RunAllPendingInMessageLoop();
+  EXPECT_TRUE(EventTypesToString(filter->events()).find("GESTURE_TAP_DOWN") !=
+              std::string::npos);
+  filter->events().clear();

[sadrul, 2013/08/23 03:16:03]

An interesting test would be to generate a Tap, or a Scroll gesture using
EventGenerator, in a way that the Window that receives the TAP_DOWN does a
repost. The test would verify that after TAP_DOWN is reposted, the rest of the
events (i.e. TAP, or SCROLL_BEGIN etc.) go to the new target.

+}
+
 }  // namespace aura