cc: Invalidate eviction tiles cache when a tile is deleted.

cc: Invalidate eviction tiles cache when a tile is deleted.

This patch ensures that the eviction tiles cache becomes invalid
when a tile is removed from it. Without this patch, it is possible
that the eviction cache holds on to a tile pointer that would end
up pointing to a deleted tile (and thus when it gets evicted,
we'll access an invalid tile).

BUG=424487
R=reveman

Committed: https://crrev.com/706afa6fe732449d962c9b17a723afa86a8c7bf4
Cr-Commit-Position: refs/heads/master@{#300222}

[vmpstr, 2014-10-18 08:10:14]

PTAL

[reveman, 2014-10-18 17:09:15]

lgtm

https://codereview.chromium.org/669433002/diff/1/cc/resources/picture_layer_t...
File cc/resources/picture_layer_tiling_unittest.cc (right):

https://codereview.chromium.org/669433002/diff/1/cc/resources/picture_layer_t...
cc/resources/picture_layer_tiling_unittest.cc:67: bool
get_eviction_tiles_cache_valid() const {
nit: simply "eviction_tiles_cache_valid"

[vmpstr, 2014-10-18 19:31:57]

https://codereview.chromium.org/669433002/diff/1/cc/resources/picture_layer_t...
File cc/resources/picture_layer_tiling_unittest.cc (right):

https://codereview.chromium.org/669433002/diff/1/cc/resources/picture_layer_t...
cc/resources/picture_layer_tiling_unittest.cc:67: bool
get_eviction_tiles_cache_valid() const {
On 2014/10/18 17:09:15, reveman wrote:
> nit: simply "eviction_tiles_cache_valid"

Done.

[vmpstr, 2014-10-18 19:32:00]

The CQ bit was checked by vmpstr@chromium.org

[commit-bot: I haz the power, 2014-10-18 19:43:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/669433002/20001

[commit-bot: I haz the power, 2014-10-18 22:05:11]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-10-18 22:05:54]

Patchset 2 (id:??) landed as
https://crrev.com/706afa6fe732449d962c9b17a723afa86a8c7bf4
Cr-Commit-Position: refs/heads/master@{#300222}