Remove mute and volume state from WebMediaPlayerClientImpl

Removed the m_volume and m_muted state in WebMediaPlayerClientImpl and
fixed a few minor bugs caused by this state being inconsistantly
updated between HTMLMediaElement and WebMediaPlayerClientImpl.

BUG=350571
TEST=All layout tests still pass.

Review URL: https://codereview.chromium.org/191673002

git-svn-id: svn://svn.chromium.org/blink/trunk@168856 bbb929c8-8fbe-4397-9dbb-9b2b20218538
use SkColorType instead of (deprecated) SkBitmap::Config

patch from issue 192423002

BUG=

Review URL: https://codereview.chromium.org/190543010

git-svn-id: svn://svn.chromium.org/blink/trunk@168857 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Trace where timers were scheduled in Blink

This required adding a TraceLocation class
modeled after base::Location in Chromium.

This makes TraceLocation a required parameter
to all Timer::start* calls.

BUG=350592
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/189833009

git-svn-id: svn://svn.chromium.org/blink/trunk@168858 bbb929c8-8fbe-4397-9dbb-9b2b20218538