Remove a linear search in SkPictureRecord::addTextBlob.

Remove a linear search in SkPictureRecord::addTextBlob.

It doesn't seem that harmful to have repeated text blobs in the array
if they occur within the same picture recording. And that does not seem
to be a common occurrence right now anyhow.

BUG=skia:2919
Committed: https://skia.googlesource.com/skia/+/dd1e9f75969c72da53657e58a080c47b30f64140

[jbroman, 2014-09-08 16:39:03]

jbroman@chromium.org changed reviewers:
+ fmalita@chromium.org, reed@google.com

[jbroman, 2014-09-08 16:39:03]

Is there any reason to do this search? It shows up on profiles when I turn on
text blob caching (CL forthcoming).

[reed1, 2014-09-08 18:32:48]

reed@google.com changed reviewers:
+ mtklein@google.com

[mtklein, 2014-09-08 19:16:34]

Very LGTM

This is how we record SkTextBlobs into SkRecord, no dedup.

[jbroman, 2014-09-08 20:17:05]

The CQ bit was checked by jbroman@chromium.org

[commit-bot: I haz the power, 2014-09-08 20:17:43]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/jbroman@chromium.org/550043003/1

[commit-bot: I haz the power, 2014-09-08 20:24:36]

Committed patchset #1 (id:1) as dd1e9f75969c72da53657e58a080c47b30f64140