Don't use the touch rect when targetting above the touch handles

Don't use the touch rect when targetting above the touch handles

The touch selection handles are positioned below the selected line of
text. Currently, we use the touch radius to make targetting the handles
easier, but this can make it difficult for the user to interact with the
selected line of text, e.g., to reposition the cursor by tapping.

Fix this by not preventing the handles from consuming touches that are
strictly above the touch handle region.

BUG=522250
Committed: https://crrev.com/9a8aabd750733342d5d027be868754f25956a757
Cr-Commit-Position: refs/heads/master@{#344374}

[jdduke (slow), 2015-08-18 22:10:26]

jdduke@chromium.org changed reviewers:
+ mohsen@chromium.org

[jdduke (slow), 2015-08-18 22:10:26]

mohsen@: PTAL, thanks.

[mohsen, 2015-08-18 22:42:18]

lgtm

[jdduke (slow), 2015-08-18 22:51:24]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2015-08-18 22:51:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-18 22:51:50]

This CL has an open dependency (Issue 1293083003 Patch 1). Please resolve the
dependency and try again.

[jdduke (slow), 2015-08-19 19:28:05]

The CQ bit was checked by jdduke@chromium.org

[jdduke (slow), 2015-08-19 19:28:05]

The patchset sent to the CQ was uploaded after l-g-t-m from mohsen@chromium.org
Link to the patchset: https://codereview.chromium.org/1294933006/#ps20001
(title: "Rebase")

[commit-bot: I haz the power, 2015-08-19 19:28:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1294933006/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1294933006/20001

[commit-bot: I haz the power, 2015-08-19 21:57:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-19 21:57:24]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[jdduke (slow), 2015-08-19 22:57:34]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2015-08-19 22:58:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1294933006/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1294933006/20001

[commit-bot: I haz the power, 2015-08-20 00:11:22]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-20 00:12:26]

Patchset 2 (id:??) landed as
https://crrev.com/9a8aabd750733342d5d027be868754f25956a757
Cr-Commit-Position: refs/heads/master@{#344374}