Eraser tool type plumbing from ui/events to web events and PPAPI.

third_party/WebKit/public/platform/WebInputEvent.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 169 matching lines @@
         // by accessibility code first before normal input event processing.
         IsTouchAccessibility = 1 << 13,
 
         IsComposing      = 1 << 14,
 
         AltGrKey         = 1 << 15,
         FnKey            = 1 << 16,
         SymbolKey        = 1 << 17,
 
         ScrollLockOn     = 1 << 18,
+
+        // Indicates that a stylys event is using an eraser tool instead of a
+        // pen tool. Used by PPAPI.
+        IsEraser         = 1 << 19

[bradnelson, 2016/08/30 18:19:29]

Maybe keep this contiguous with the others? So the ppapi modifiers are
contiguous (these probably don't care). We should ask bbudge, will add him.

[denniskempin, 2016/08/30 18:27:41]

I think ideally we would not need this flag here, it's really just here to make
sure the PPAPI modifiers can stay in sync with the ui modifiers and won't end up
conflicting after future changes to modifiers. the ui::Events never use this
flag.
Any alternative suggestions how we could do this?

[dtapuska, 2016/08/30 18:37:45]

I'd break the contract in event_conversion.cpp of ppapi modifiers matching
webinputevent modifiers.

Is there a consumer of the ppapi for erasers? or is this just for completeness?
I thought the primary use cases of pointer events was HTML based apps and not
flash.

[denniskempin, 2016/08/30 20:49:35]

Done.

     };
 
     // Indicates whether the browser needs to block on the ACK result for
     // this event, and if not why note (for metrics/diagnostics purposes).
     // These values are direct mappings of the values in PlatformEvent
     // so the values can be cast between the enumerations. static_asserts
     // checking this are in web/WebInputEventConversion.cpp.
     enum DispatchType {
         // Event can be canceled.
         Blocking,
@@ skipping 443 matching lines @@
         , uniqueTouchEventId(0)
     {
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif