Add code to collect crash data for https://crbug.com/592319.

content/browser/renderer_host/render_widget_host_input_event_router.h

Index: content/browser/renderer_host/render_widget_host_input_event_router.h
diff --git a/content/browser/renderer_host/render_widget_host_input_event_router.h b/content/browser/renderer_host/render_widget_host_input_event_router.h
index b4123539c5831f6b124b6ba3e4bd72beb34c6dce..9c5cacc51d847ee598af9f8b6a8ac07fd75db23b 100644
--- a/content/browser/renderer_host/render_widget_host_input_event_router.h
+++ b/content/browser/renderer_host/render_widget_host_input_event_router.h
@@ -121,6 +121,15 @@ class CONTENT_EXPORT RenderWidgetHostInputEventRouter
   std::unordered_map<cc::SurfaceId, HittestData, cc::SurfaceIdHash>
       hittest_data_;
 
+  // Debugging data for https://crbug.com/592319.
+  unsigned long number_of_gesture_targets_enqueued_;
+  unsigned long number_of_gesture_targets_dequeued_;
+  static const unsigned kNumLastEventTypes = 5;
+  int last_gesture_event_types_[kNumLastEventTypes];
+  int last_touch_event_types_[kNumLastEventTypes];
+  unsigned last_gesture_event_index_;
+  unsigned last_touch_event_index_;

[tdresser, 2016/03/09 19:53:45]

Would the dump still be easily legible if you dumped this in a separate struct?
It might be a bit cleaner to keep these grouped nicely.

[wjmaclean, 2016/03/09 21:28:31]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostInputEventRouter);
   FRIEND_TEST_ALL_PREFIXES(SitePerProcessBrowserTest,
                            InputEventRouterGestureTargetQueueTest);