touch: Make sure the correct radius values are used for touch events.

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 392 matching lines @@
       break;
     }
     default:
       DLOG(WARNING) << "Unknown touch event " << event->type();
       break;
   }
 
   if (!point)
     return NULL;
 
-  point->radiusX = event->radius_x();
-  point->radiusY = event->radius_y();
+  // The spec requires the radii values to be positive (and 1 when unknown).
+  point->radiusX = std::max(1.f, event->radius_x());
+  point->radiusY = std::max(1.f, event->radius_y());
   point->rotationAngle = event->rotation_angle();
   point->force = event->force();
 
   // Update the location and state of the point.
   point->state = TouchPointStateFromEvent(event);
   if (point->state == WebKit::WebTouchPoint::StateMoved) {
     // It is possible for badly written touch drivers to emit Move events even
     // when the touch location hasn't changed. In such cases, consume the event
     // and pretend nothing happened.
     if (point->position.x == event->x() && point->position.y == event->y())
@@ skipping 15 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