Construct and check for mojo::Event's LocationData as needed.

components/html_viewer/touch_handler.cc

 // Copyright 2015 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 "components/html_viewer/touch_handler.h"
 
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "third_party/WebKit/public/web/WebWidget.h"
 #include "ui/events/base_event_utils.h"
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/gesture_detection/gesture_provider_config_helper.h"
 #include "ui/events/gesture_detection/motion_event_generic.h"
 #include "ui/mojo/events/input_events.mojom.h"
 
 namespace html_viewer {
 namespace {
 
 // TODO(rjkroege): Gesture recognition currently happens in the html_viewer.
 // In phase2, it will be relocated to MUS. Update this code at that time.
 void SetPropertiesFromEvent(const mojo::Event& event,
                             ui::PointerProperties* properties) {
-  properties->id = event.pointer_data->pointer_id;
-  properties->x = event.pointer_data->location->x;
-  properties->y = event.pointer_data->location->y;
-  properties->raw_x = event.pointer_data->location->screen_x;
-  properties->raw_y = event.pointer_data->location->screen_y;
+  if (event.pointer_data) {
+    properties->id = event.pointer_data->pointer_id;
+    if (event.pointer_data->location) {
+      properties->x = event.pointer_data->location->x;
+      properties->y = event.pointer_data->location->y;
+      properties->raw_x = event.pointer_data->location->screen_x;
+      properties->raw_y = event.pointer_data->location->screen_y;
+    }
+  }
 
-  if (event.pointer_data->kind == mojo::POINTER_KIND_TOUCH ||
-      event.pointer_data->kind == mojo::POINTER_KIND_PEN) {
+  if (event.pointer_data && event.pointer_data->brush_data &&
+      (event.pointer_data->kind == mojo::POINTER_KIND_TOUCH ||
+       event.pointer_data->kind == mojo::POINTER_KIND_PEN)) {
     properties->pressure = event.pointer_data->brush_data->pressure;
 
     // TODO(rjkroege): vary orientation for width, height.
     properties->SetAxesAndOrientation(event.pointer_data->brush_data->width,
                                       event.pointer_data->brush_data->height,
                                       0.0);
   } else {
     if (event.flags & mojo::EVENT_FLAGS_LEFT_MOUSE_BUTTON ||
         event.flags & mojo::EVENT_FLAGS_MIDDLE_MOUSE_BUTTON ||
         event.flags & mojo::EVENT_FLAGS_MIDDLE_MOUSE_BUTTON) {
@@ skipping 138 matching lines @@
 
   blink::WebTouchEvent web_event = ui::CreateWebTouchEventFromMotionEvent(
       *current_motion_event_, result.did_generate_scroll);
   gesture_provider_.OnTouchEventAck(web_event.uniqueTouchEventId,
                                     web_widget_->handleInputEvent(web_event));
 }
 
 void TouchHandler::PostProcessMotionEvent(const mojo::Event& event) {
   switch (event.action) {
     case mojo::EVENT_TYPE_POINTER_UP: {
-      const int index = current_motion_event_->FindPointerIndexOfId(
-          event.pointer_data->pointer_id);
-      current_motion_event_->RemovePointerAt(index);
+      if (event.pointer_data) {
+        const int index = current_motion_event_->FindPointerIndexOfId(
+            event.pointer_data->pointer_id);
+        current_motion_event_->RemovePointerAt(index);
+      }
       if (current_motion_event_->GetPointerCount() == 0)
         current_motion_event_.reset();
       break;
     }
 
     case mojo::EVENT_TYPE_POINTER_CANCEL:
       current_motion_event_.reset();
       break;
 
     default:
       break;
   }
 }
 
 }  // namespace html_viewer