The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb

commit e743aab0046cdb15f7b1b5b837ebfad1a06f42cb
Author: Charlie Harrison <csharrison@chromium.org>
Date: Fri Sep 28 17:13:33 2018

Add SpeechSynthesisErrorEvent IDL interface

See spec:
https://w3c.github.io/speech-api/#speechsynthesiserrorevent

and discussion on i2s on blink-dev:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/8_H3FUZm23g

Previously, errors were just going through as SpeechSynthesisEvents.
This CL now dispatches errors as SpeechSynthesisErrorEvents with an
empty "error" method.

This CL also adds constructors on both SpeechSynthesisEvent and
SpeechSynthesisErrorEvent.

Bug:  885297 
Change-Id: I70ba998182943a50e17f2fc11eb7e163d8289e94
Reviewed-on: https://chromium-review.googlesource.com/1231839
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595128}
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/WebKit/LayoutTests/external/wpt/interfaces/speech-api.idl
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/WebKit/LayoutTests/external/wpt/speech-api/SpeechSynthesis-speak-without-activation-fails.tentative.html
[add] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/WebKit/LayoutTests/external/wpt/speech-api/SpeechSynthesisErrorEvent-constructor.html
[add] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/WebKit/LayoutTests/external/wpt/speech-api/SpeechSynthesisEvent-constructor.html
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/WebKit/LayoutTests/external/wpt/speech-api/idlharness.window-expected.txt
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/bindings/modules/BUILD.gn
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/modules_idl_files.gni
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/BUILD.gn
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis.cc
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis.h
[add] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis_error_event.cc
[add] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis_error_event.h
[add] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis_error_event.idl
[add] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis_error_event_init.idl
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis_event.cc
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis_event.h
[modify] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis_event.idl
[add] https://crrev.com/e743aab0046cdb15f7b1b5b837ebfad1a06f42cb/third_party/blink/renderer/modules/speech/speech_synthesis_event_init.idl

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/589e483bd562efe06b1bda986be07012907702bb

commit 589e483bd562efe06b1bda986be07012907702bb
Author: Charlie Harrison <csharrison@chromium.org>
Date: Mon Oct 01 20:07:05 2018

Add spec links to speech idls

TBR=haraken@chromium.org

Bug:  885297 
Change-Id: Ic7a6df89b771062e3327736fec64aff3d124286f
Reviewed-on: https://chromium-review.googlesource.com/1254322
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595533}
[modify] https://crrev.com/589e483bd562efe06b1bda986be07012907702bb/third_party/blink/renderer/modules/speech/speech_synthesis_error_event.idl
[modify] https://crrev.com/589e483bd562efe06b1bda986be07012907702bb/third_party/blink/renderer/modules/speech/speech_synthesis_error_event_init.idl
[modify] https://crrev.com/589e483bd562efe06b1bda986be07012907702bb/third_party/blink/renderer/modules/speech/speech_synthesis_event_init.idl