Make BBH::search() const.

Make BBH::search() const.

I'd like to have SkRecordDraw() work with a const SkBBoxHierarchy*, but
can't quite today.  The only interesting change here is no longer flushing
if needed in RTree; instead we assert we've been flushed already.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/8875a0413686eb3dc9f7d7d18a2cee9076aade54

[mtklein, 2014-08-08 18:16:23]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-08-08 18:17:23]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/452233002/1

[commit-bot: I haz the power, 2014-08-08 18:17:24]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-08-09 00:17 UTC

[robertphillips, 2014-08-08 18:24:23]

https://codereview.chromium.org/452233002/diff/1/src/core/SkTileGrid.h
File src/core/SkTileGrid.h (right):

https://codereview.chromium.org/452233002/diff/1/src/core/SkTileGrid.h#newcode77
src/core/SkTileGrid.h:77: private:
can this return "const SkTDArray<void>&" ?

[mtklein, 2014-08-08 18:37:35]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-08-08 18:38:40]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/452233002/20001

[commit-bot: I haz the power, 2014-08-08 18:38:41]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-08-09 00:38 UTC

[mtklein, 2014-08-08 18:38:50]

https://codereview.chromium.org/452233002/diff/1/src/core/SkTileGrid.h
File src/core/SkTileGrid.h (right):

https://codereview.chromium.org/452233002/diff/1/src/core/SkTileGrid.h#newcode77
src/core/SkTileGrid.h:77: private:
On 2014/08/08 18:24:23, robertphillips wrote:
> can this return "const SkTDArray<void>&" ?

Looks like yes, though it's a little more involved than you'd think.  Have a
look?

[robertphillips, 2014-08-08 18:39:51]

lgtm

[commit-bot: I haz the power, 2014-08-08 18:49:45]

Change committed as 8875a0413686eb3dc9f7d7d18a2cee9076aade54