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This change does the following:
- Splits the input field into text, hint and cursor elements.
- Removes the need to re-render text when the cursor blinks.
- Supports a text hint, shown when the field is empty.

BUG=

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ifbf32560cb7003f4d8951bea871680facd5c0a81
Reviewed-on: https://chromium-review.googlesource.com/804114Reviewed-by: Yash Malik <ymalik@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521497}