Revert 1675973002 and 1683213002.

Revert 1675973002 and 1683213002.

Reason for revert:
Speculative revert: appears to break printing/webgl-oversized-printing.html on Linux MSAN: https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/builds/8511

and possibly a bunch of other webkit tests.

Revert "Prefer to use the OES_depth24 extension for WebGL's depth-only back buffers."

This reverts commit 2374479265b26ba0a4a658582b068a4526220774.

Revert "Clean up drawing buffer code."

This reverts commit d89c4e01716053d7bd4642f42c8d4a1ecefcaf92.

BUG=584807
TBR=kbr@chromium.org

Committed: https://crrev.com/484475eb5757acd278b7ca323d2b2a2f074d196e
Cr-Commit-Position: refs/heads/master@{#375550}

[phoglund_chromium, 2016-02-16 11:02:00]

Description was changed from

==========
Revert 1675973002 and 1683213002.

Reason for revert:
Speculative revert: appears to break printing/webgl-oversized-printing.html on
Linux MSAN:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/b...

and possibly a bunch of other webkit tests.

Revert "Prefer to use the OES_depth24 extension for WebGL's depth-only back
buffers."

This reverts commit 2374479265b26ba0a4a658582b068a4526220774.

Revert "Clean up drawing buffer code."

This reverts commit d89c4e01716053d7bd4642f42c8d4a1ecefcaf92.

BUG=584807
==========

to

==========
Revert 1675973002 and 1683213002.

Reason for revert:
Speculative revert: appears to break printing/webgl-oversized-printing.html on
Linux MSAN:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/b...

and possibly a bunch of other webkit tests.

Revert "Prefer to use the OES_depth24 extension for WebGL's depth-only back
buffers."

This reverts commit 2374479265b26ba0a4a658582b068a4526220774.

Revert "Clean up drawing buffer code."

This reverts commit d89c4e01716053d7bd4642f42c8d4a1ecefcaf92.

BUG=584807
TBR=kbr@chromium.org
==========

[phoglund_chromium, 2016-02-16 11:02:00]

phoglund@chromium.org changed reviewers:
+ kbr@chromium.org, zmo@chromium.ort

[phoglund_chromium, 2016-02-16 11:02:13]

The CQ bit was checked by phoglund@chromium.org

[phoglund_chromium, 2016-02-16 11:02:53]

I'm going to try this to see if this greens up some webkit tests, feel free to
revert this if that isn't the case.

[commit-bot: I haz the power, 2016-02-16 11:02:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1698303002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1698303002/1

[commit-bot: I haz the power, 2016-02-16 12:10:30]

Description was changed from

==========
Revert 1675973002 and 1683213002.

Reason for revert:
Speculative revert: appears to break printing/webgl-oversized-printing.html on
Linux MSAN:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/b...

and possibly a bunch of other webkit tests.

Revert "Prefer to use the OES_depth24 extension for WebGL's depth-only back
buffers."

This reverts commit 2374479265b26ba0a4a658582b068a4526220774.

Revert "Clean up drawing buffer code."

This reverts commit d89c4e01716053d7bd4642f42c8d4a1ecefcaf92.

BUG=584807
TBR=kbr@chromium.org
==========

to

==========
Revert 1675973002 and 1683213002.

Reason for revert:
Speculative revert: appears to break printing/webgl-oversized-printing.html on
Linux MSAN:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/b...

and possibly a bunch of other webkit tests.

Revert "Prefer to use the OES_depth24 extension for WebGL's depth-only back
buffers."

This reverts commit 2374479265b26ba0a4a658582b068a4526220774.

Revert "Clean up drawing buffer code."

This reverts commit d89c4e01716053d7bd4642f42c8d4a1ecefcaf92.

BUG=584807
TBR=kbr@chromium.org
==========

[commit-bot: I haz the power, 2016-02-16 12:10:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-16 22:52:12]

Description was changed from

==========
Revert 1675973002 and 1683213002.

Reason for revert:
Speculative revert: appears to break printing/webgl-oversized-printing.html on
Linux MSAN:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/b...

and possibly a bunch of other webkit tests.

Revert "Prefer to use the OES_depth24 extension for WebGL's depth-only back
buffers."

This reverts commit 2374479265b26ba0a4a658582b068a4526220774.

Revert "Clean up drawing buffer code."

This reverts commit d89c4e01716053d7bd4642f42c8d4a1ecefcaf92.

BUG=584807
TBR=kbr@chromium.org
==========

to

==========
Revert 1675973002 and 1683213002.

Reason for revert:
Speculative revert: appears to break printing/webgl-oversized-printing.html on
Linux MSAN:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/b...

and possibly a bunch of other webkit tests.

Revert "Prefer to use the OES_depth24 extension for WebGL's depth-only back
buffers."

This reverts commit 2374479265b26ba0a4a658582b068a4526220774.

Revert "Clean up drawing buffer code."

This reverts commit d89c4e01716053d7bd4642f42c8d4a1ecefcaf92.

BUG=584807
TBR=kbr@chromium.org

Committed: https://crrev.com/484475eb5757acd278b7ca323d2b2a2f074d196e
Cr-Commit-Position: refs/heads/master@{#375550}
==========

[commit-bot: I haz the power, 2016-02-16 22:52:13]

Patchset 1 (id:??) landed as
https://crrev.com/484475eb5757acd278b7ca323d2b2a2f074d196e
Cr-Commit-Position: refs/heads/master@{#375550}