[Pkg-chromium-maint] Bug#848029: chromium: v55 security upgrade broke Pulseaudio support on jessie

[fld]

Package: chromium
Version: 55.0.2883.75-1~deb8u1
Severity: important

Dear Maintainer,

After upgrading from 53.0.2785.89-1~deb8u1 to 55.0.2883.75-1~deb8u1,
Chromium is unable to properly use Pulseaudio. When I open a website
with audio (a YouTube video for example), Chromium starts opening and closing
'ALSA Playback'-sinks at very rapid rate (thousands of times per minute).
This makes audio extremely degraded and causes some noticeable CPU load.

Downgrading back to to v53 immediately fixes the problem.

I'm using jessies Pulseaudio 5.0-13 with default settings in
a plasma-desktop 4 desktop environment.

% cat .asoundrc
pcm.pulse {
   type pulse
   hint.description "Default Audio Device"
}

ctl.pulse {
   type pulse
}

pcm.default pulse
ctl.default pulse



-- System Information:
Debian Release: 8.6
  APT prefers stable
  APT policy: (990, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-grsec-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages chromium depends on:
ii  libasound2           1.0.28-1
ii  libatk1.0-0          2.14.0-1
ii  libc6                2.19-18+deb8u6
ii  libcairo2            1.14.0-2.1+deb8u1
ii  libcups2             1.7.5-11+deb8u1
ii  libdbus-1-3          1.8.20-0+deb8u1
ii  libexpat1            2.1.0-6+deb8u3
ii  libfontconfig1       2.11.0-6.3+deb8u1
ii  libfreetype6         2.5.2-3+deb8u1
ii  libgcc1              1:4.9.2-10
ii  libgdk-pixbuf2.0-0   2.31.1-2+deb8u5
ii  libglib2.0-0         2.42.1-1+b1
ii  libgtk2.0-0          2.24.25-3+deb8u1
ii  libjpeg62-turbo      1:1.3.1-12
ii  libnspr4             2:4.12-1+debu8u1
ii  libnss3              2:3.26-1+debu8u1
ii  libpango-1.0-0       1.36.8-3
ii  libpangocairo-1.0-0  1.36.8-3
ii  libpng12-0           1.2.50-2+deb8u2
ii  libstdc++6           4.9.2-10
ii  libwebp5             0.4.1-1.2+b2
ii  libwebpdemux1        0.4.1-1.2+b2
ii  libx11-6             2:1.6.2-3
ii  libx11-xcb1          2:1.6.2-3
ii  libxcb1              1.10-3+b1
ii  libxcomposite1       1:0.4.4-1
ii  libxcursor1          1:1.1.14-1+b1
ii  libxdamage1          1:1.1.4-2+b1
ii  libxext6             2:1.3.3-1
ii  libxfixes3           1:5.0.1-2+b2
ii  libxi6               2:1.7.4-1+b2
ii  libxml2              2.9.1+dfsg1-5+deb8u3
ii  libxrandr2           2:1.4.2-1+b1
ii  libxrender1          1:0.9.8-1+b1
ii  libxslt1.1           1.1.28-2+deb8u2
ii  libxss1              1:1.2.2-1
ii  libxtst6             2:1.2.2-1+b1
ii  x11-utils            7.7+2
ii  xdg-utils            1.1.0~rc1+git20111210-7.4

chromium recommends no packages.

Versions of packages chromium suggests:
pn  chromium-inspector  <none>
pn  chromium-l10n       <none>

-- no debconf information