gesture recognizer: Expose bounding-box for the points in a gesture-event.

content/browser/renderer_host/web_input_event_aurax11.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.
 
 // Portions based heavily on:
 // third_party/WebKit/Source/WebKit/chromium/public/gtk/WebInputEventFactory.cpp
 //
 /*
  * Copyright (C) 2006-2011 Google Inc. All rights reserved.
  *
@@ skipping 395 matching lines @@
     case ui::ET_GESTURE_MULTIFINGER_SWIPE:
       break;
     default:
       NOTREACHED() << "Unknown gesture type: " << event->type();
   }
 
   gesture_event.deltaX = event->details().generic_x();
   gesture_event.deltaY = event->details().generic_y();
   gesture_event.modifiers = EventFlagsToWebEventModifiers(event->flags());
 
+  // WebKit gesture events do not have bounding-boxes yet, and expect the data
+  // in deltaX/deltaY instead (and instead of bounding box, WebKit expects the
+  // radius). This is currently used only for tap events. So special case this
+  // particular case.
+  // http://crbug.com/138572
+  if (event->type() == ui::ET_GESTURE_TAP) {
+    gesture_event.deltaX = event->details().bounding_box().width() / 2;
+    gesture_event.deltaY = event->details().bounding_box().height() / 2;
+  }
+
   return gesture_event;
 }
 
 WebKit::WebTouchPoint* UpdateWebTouchEventFromAuraEvent(
     aura::TouchEvent* event, WebKit::WebTouchEvent* web_event) {
   WebKit::WebTouchPoint* point = NULL;
   switch (event->type()) {
     case ui::ET_TOUCH_PRESSED:
       // Add a new touch point.
       if (web_event->touchesLength < WebKit::WebTouchEvent::touchesLengthCap) {
@@ skipping 55 matching lines @@
 
   // Update the type of the touch event.
   web_event->type = TouchEventTypeFromEvent(event);
   web_event->timeStampSeconds = event->time_stamp().InSecondsF();
   web_event->modifiers = EventFlagsToWebEventModifiers(event->flags());
 
   return point;
 }
 
 }  // namespace content