Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler tasks in tracing

Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler tasks in tracing

This CL requires https://codereview.chromium.org/2374193002 as a prerequisite.
That CL has been dropped for the time being and this CL is thus merely meant to show how
this could be done if TRACE_TASK_EXECUTION didn't use up all (2) trace event parameters
already. Meanwhile, TaskScheduler will report its args using another trace event (resulting
in two events per tasks when the "taskscheduler" tracing category is enabled..):
https://codereview.chromium.org/2392903002.

BUG=649084

[gab, 2016-10-04 13:00:09]

Patchset #1 (id:1) has been deleted

[gab, 2016-10-04 13:00:15]

Patchset #1 (id:20001) has been deleted

[gab, 2016-10-04 13:00:46]

Description was changed from

==========
Add ExecutionMode and SequenceToken as arguments of TaskScheduler tasks in
tracing

BUG=649084
==========

to

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

BUG=649084
==========

[gab, 2016-10-04 13:02:33]

Description was changed from

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

BUG=649084
==========

to

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

This CL requires https://codereview.chromium.org/2374193002 as a prerequisite.
That CL has been dropped for the time being and this CL is merely meant to show
how
this could be done if TRACE_TASK_EXECUTION didn't use up all (2) trace event
parameters
already.

BUG=649084
==========

[gab, 2016-10-04 13:02:52]

Description was changed from

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

This CL requires https://codereview.chromium.org/2374193002 as a prerequisite.
That CL has been dropped for the time being and this CL is merely meant to show
how
this could be done if TRACE_TASK_EXECUTION didn't use up all (2) trace event
parameters
already.

BUG=649084
==========

to

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

This CL requires https://codereview.chromium.org/2374193002 as a prerequisite.
That CL has been dropped for the time being and this CL is thus merely meant to
show how
this could be done if TRACE_TASK_EXECUTION didn't use up all (2) trace event
parameters
already.

BUG=649084
==========

[gab, 2016-10-04 13:08:10]

Description was changed from

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

This CL requires https://codereview.chromium.org/2374193002 as a prerequisite.
That CL has been dropped for the time being and this CL is thus merely meant to
show how
this could be done if TRACE_TASK_EXECUTION didn't use up all (2) trace event
parameters
already.

BUG=649084
==========

to

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

This CL requires https://codereview.chromium.org/2374193002 as a prerequisite.
That CL has been dropped for the time being and this CL is thus merely meant to
show how
this could be done if TRACE_TASK_EXECUTION didn't use up all (2) trace event
parameters
already. Meanwhile, TaskScheduler will report its args using another trace event
(resulting
in two events per tasks when the "taskscheduler" tracing category is enabled..).

BUG=649084
==========

[gab, 2016-10-04 13:41:04]

Description was changed from

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

This CL requires https://codereview.chromium.org/2374193002 as a prerequisite.
That CL has been dropped for the time being and this CL is thus merely meant to
show how
this could be done if TRACE_TASK_EXECUTION didn't use up all (2) trace event
parameters
already. Meanwhile, TaskScheduler will report its args using another trace event
(resulting
in two events per tasks when the "taskscheduler" tracing category is enabled..).

BUG=649084
==========

to

==========
Add ExecutionMode/SequenceToken and TaskPriority as arguments of TaskScheduler
tasks in tracing

This CL requires https://codereview.chromium.org/2374193002 as a prerequisite.
That CL has been dropped for the time being and this CL is thus merely meant to
show how
this could be done if TRACE_TASK_EXECUTION didn't use up all (2) trace event
parameters
already. Meanwhile, TaskScheduler will report its args using another trace event
(resulting
in two events per tasks when the "taskscheduler" tracing category is enabled..):
https://codereview.chromium.org/2392903002.

BUG=649084
==========