Update PaintLayer::needsPaintPhase flags when layer self-painting status changes

Update PaintLayer::needsPaintPhase flags when layer self-painting status changes

This had been included in https://codereview.chromium.org/1862313002/
before I removed it thinking that self-painting status should cause
layout and paint invalidation. However, bug 604351 is a case that
self-painting status change doesn't cause layout and paint invalidation.

BUG=604351
TEST=PaintLayerPainterTest.PaintPhasesUpdateOnBecomingSelfPainting
TEST=PaintLayerPainterTest.PaintPhasesUpdateOnBecomingNonSelfPainting

Review URL: https://codereview.chromium.org/1900263002

Cr-Commit-Position: refs/heads/master@{#388880}

Committed: https://chromium.googlesource.com/chromium/src/+/f984c3395c994122091f7e7db88c8776f51f9b0e

[Xianzhu, 2016-04-22 21:43:26]

Description was changed from

==========
Update PaintLayer::needsPaintPhase flags when layer self-painting status changes

This had been included in https://codereview.chromium.org/1862313002/
before I removed it thinking that self-painting status should cause
layout and paint invalidation. However, bug 604351 is a case that
self-painting status change doesn't cause layout and paint invalidation.

BUG=604351
TEST=PaintLayerPainterTest.PaintPhasesUpdateOnBecomingSelfPainting
TEST=PaintLayerPainterTest.PaintPhasesUpdateOnBecomingNonSelfPainting

Review URL: https://codereview.chromium.org/1900263002

Cr-Commit-Position: refs/heads/master@{#388880}
==========

to

==========
Update PaintLayer::needsPaintPhase flags when layer self-painting status changes

This had been included in https://codereview.chromium.org/1862313002/
before I removed it thinking that self-painting status should cause
layout and paint invalidation. However, bug 604351 is a case that
self-painting status change doesn't cause layout and paint invalidation.

BUG=604351
TEST=PaintLayerPainterTest.PaintPhasesUpdateOnBecomingSelfPainting
TEST=PaintLayerPainterTest.PaintPhasesUpdateOnBecomingNonSelfPainting

Review URL: https://codereview.chromium.org/1900263002

Cr-Commit-Position: refs/heads/master@{#388880}

Committed:
https://chromium.googlesource.com/chromium/src/+/f984c3395c994122091f7e7db88c...
==========

[Xianzhu, 2016-04-22 21:43:28]

Committed patchset #1 (id:1) manually as
f984c3395c994122091f7e7db88c8776f51f9b0e.