[WIP] Allow scroll events to permanently change the default gesture handler in RootView

ui/views/widget/widget_interactive_uitest.cc

 // Copyright (c) 2013 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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
@@ skipping 40 matching lines @@
  private:
   // Overridden from View:
   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE {
     GetWidget()->Close();
     base::MessageLoop::current()->QuitNow();
   }
 
   DISALLOW_COPY_AND_ASSIGN(ExitLoopOnRelease);
 };
 
-// A view that does a capture on gesture-begin events.
+// A view that does a capture on ui::ET_GESTURE_TAP_DOWN events.
 class GestureCaptureView : public View {
  public:
   GestureCaptureView() {}
   virtual ~GestureCaptureView() {}
 
  private:
   // Overridden from View:
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE {
-    if (event->type() == ui::ET_GESTURE_BEGIN) {
+    if (event->type() == ui::ET_GESTURE_TAP_DOWN) {
       GetWidget()->SetCapture(this);
       event->StopPropagation();
     }
   }
 
   DISALLOW_COPY_AND_ASSIGN(GestureCaptureView);
 };
 
 // A view that always processes all mouse events.
 class MouseView : public View {
@@ skipping 209 matching lines @@
   container->AddChildView(gesture);
 
   MouseView* mouse = new MouseView;
   mouse->SetBounds(30, 0, 30, 30);
   container->AddChildView(mouse);
 
   toplevel->SetSize(gfx::Size(100, 100));
   toplevel->Show();
 
   // Start a gesture on |gesture|.
-  ui::GestureEvent begin(15,
-                         15,
-                         0,
-                         base::TimeDelta(),
-                         ui::GestureEventDetails(ui::ET_GESTURE_BEGIN, 0, 0));
+  ui::GestureEvent tap_down(15,
+                            15,
+                            0,
+                            base::TimeDelta(),
+                            ui::GestureEventDetails(ui::ET_GESTURE_TAP_DOWN,
+                                                    0,
+                                                    0));
   ui::GestureEvent end(15,
                        15,
                        0,
                        base::TimeDelta(),
                        ui::GestureEventDetails(ui::ET_GESTURE_END, 0, 0));
-  toplevel->OnGestureEvent(&begin);
+  toplevel->OnGestureEvent(&tap_down);
 
   // Now try to click on |mouse|. Since |gesture| will have capture, |mouse|
   // will not receive the event.
   gfx::Point click_location(45, 15);
 
   ui::MouseEvent press(ui::ET_MOUSE_PRESSED, click_location, click_location,
                        ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON);
   ui::MouseEvent release(ui::ET_MOUSE_RELEASED, click_location, click_location,
                          ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON);
 
@@ skipping 757 matching lines @@
   ui::EventDispatchDetails details = widget1.GetNativeWindow()->
       GetHost()->event_processor()->OnEventFromSource(&mouse_event);
   ASSERT_FALSE(details.dispatcher_destroyed);
   EXPECT_TRUE(widget1.GetAndClearGotMouseEvent());
   EXPECT_FALSE(widget2.GetAndClearGotMouseEvent());
 }
 #endif
 
 }  // namespace test
 }  // namespace views