Revert of cc: Build Image to Region map during image meta-data generation. (patchset #6 id:100001 o…

Revert of cc: Build Image to Region map during image meta-data generation. (patchset #6 id:100001 of https://codereview.chromium.org/2496283004/ )

Reason for revert:
Computing these image regions adds significant time to the critical path on image heavy content.  Let's re-land after addressing the performance.

BUG=670926
Original issue's description:
> cc: Build Image to Region map during image meta-data generation.
>
> During the discardable image meta-data generation phase, we build an
> Rtree to pull the set of images given a rect. This change adds a
> reverse lookup map to be built at the same time for querying the region
> for an image in a DisplayItemList.
>
> BUG=665266
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
>
> Committed: https://crrev.com/fc85c1aa0881047c4410cbedc1e4543bcf789a1f
> Cr-Commit-Position: refs/heads/master@{#432841}

TBR=vmpstr@chromium.org,khushalsagar@chromium.org
BUG=665266
Review-Url: https://codereview.chromium.org/2551583003
Cr-Commit-Position: refs/heads/master@{#436174}
(cherry picked from commit 654417a5699ed0965a94977350266bf5ce206daa)

Committed: https://chromium.googlesource.com/chromium/src/+/c006456e1c0057757977351133fd7bb2e5275b90

[vmiura, 2016-12-06 00:09:33]

Description was changed from

==========
Revert of cc: Build Image to Region map during image meta-data generation.
(patchset #6 id:100001 of https://codereview.chromium.org/2496283004/ )

Reason for revert:
Computing these image regions adds significant time to the critical path on
image heavy content.  Let's re-land after addressing the performance.

BUG=670926

Original issue's description:
> cc: Build Image to Region map during image meta-data generation.
>
> During the discardable image meta-data generation phase, we build an
> Rtree to pull the set of images given a rect. This change adds a
> reverse lookup map to be built at the same time for querying the region
> for an image in a DisplayItemList.
>
> BUG=665266
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
>
> Committed: https://crrev.com/fc85c1aa0881047c4410cbedc1e4543bcf789a1f
> Cr-Commit-Position: refs/heads/master@{#432841}

TBR=vmpstr@chromium.org,khushalsagar@chromium.org
BUG=665266

Review-Url: https://codereview.chromium.org/2551583003
Cr-Commit-Position: refs/heads/master@{#436174}
(cherry picked from commit 654417a5699ed0965a94977350266bf5ce206daa)
==========

to

==========
Revert of cc: Build Image to Region map during image meta-data generation.
(patchset #6 id:100001 of https://codereview.chromium.org/2496283004/ )

Reason for revert:
Computing these image regions adds significant time to the critical path on
image heavy content.  Let's re-land after addressing the performance.

BUG=670926

Original issue's description:
> cc: Build Image to Region map during image meta-data generation.
>
> During the discardable image meta-data generation phase, we build an
> Rtree to pull the set of images given a rect. This change adds a
> reverse lookup map to be built at the same time for querying the region
> for an image in a DisplayItemList.
>
> BUG=665266
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
>
> Committed: https://crrev.com/fc85c1aa0881047c4410cbedc1e4543bcf789a1f
> Cr-Commit-Position: refs/heads/master@{#432841}

TBR=vmpstr@chromium.org,khushalsagar@chromium.org
BUG=665266

Review-Url: https://codereview.chromium.org/2551583003
Cr-Commit-Position: refs/heads/master@{#436174}
(cherry picked from commit 654417a5699ed0965a94977350266bf5ce206daa)

Committed:
https://chromium.googlesource.com/chromium/src/+/c006456e1c0057757977351133fd...
==========

[vmiura, 2016-12-06 00:09:37]

Committed patchset #1 (id:1) manually as
c006456e1c0057757977351133fd7bb2e5275b90.