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

components/mus/gesture_manager.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/mus/gesture_manager.h"
 
 #include <algorithm>
 
 #include "components/mus/gesture_manager_delegate.h"
 #include "components/mus/public/cpp/keys.h"
@@ skipping 37 matching lines @@
   // TODO(sky): I'm doing this until things are converted. Seems as though we
   // shouldn't do this long term.
   if (result.empty())
     result.push_back(deepest);
   return result;
 }
 
 mojo::EventPtr CloneEventForView(const mojo::Event& event,
                                  const ServerView* view) {
   mojo::EventPtr result(event.Clone());
-  const gfx::PointF location(event.pointer_data->location->x,
-                             event.pointer_data->location->y);
-  const gfx::PointF target_location(
-      ConvertPointFBetweenViews(view->GetRoot(), view, location));
-  result->pointer_data->location->x = target_location.x();
-  result->pointer_data->location->y = target_location.y();
+  if (event.pointer_data && event.pointer_data->location) {
+    const gfx::PointF location(event.pointer_data->location->x,
+                               event.pointer_data->location->y);
+    const gfx::PointF target_location(
+        ConvertPointFBetweenViews(view->GetRoot(), view, location));
+    result->pointer_data->location->x = target_location.x();
+    result->pointer_data->location->y = target_location.y();
+  }
   return result.Pass();
 }
 
 }  // namespace
 
 // GestureStateChange ----------------------------------------------------------
 
 GestureStateChange::GestureStateChange()
     : chosen_gesture(GestureManager::kInvalidGestureId) {}
 
@@ skipping 454 matching lines @@
                                const ServerView* root)
     : delegate_(delegate), root_view_(root) {}
 
 GestureManager::~GestureManager() {
   // Explicitly delete the pointers first as this may result in calling back to
   // us to cleanup and delete gestures.
   active_pointers_.clear();
 }
 
 bool GestureManager::ProcessEvent(const mojo::Event& event) {
-  if (!event.pointer_data)
+  if (!event.pointer_data || !event.pointer_data->location)
     return false;
 
   ScheduledDeleteProcessor delete_processor(this);
   const gfx::Point location(static_cast<int>(event.pointer_data->location->x),
                             static_cast<int>(event.pointer_data->location->y));
   switch (event.action) {
     case mojo::EVENT_TYPE_POINTER_DOWN: {
       if (GetPointerById(event.pointer_data->pointer_id)) {
         DVLOG(1) << "received more than one down for a pointer without a "
                  << "corresponding up, id=" << event.pointer_data->pointer_id;
@@ skipping 138 matching lines @@
 void GestureManager::ScheduleDelete(Pointer* pointer) {
   auto iter =
       std::find(active_pointers_.begin(), active_pointers_.end(), pointer);
   if (iter != active_pointers_.end()) {
     active_pointers_.weak_erase(iter);
     pointers_to_delete_.push_back(pointer);
   }
 }
 
 }  // namespace mus