commit 4ce56a67280474c66724cab62195a6a524bb741d
author Xiaodan Zhu <zxdan@chromium.org> Thu Dec 22 19:48:53 2022
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Dec 22 19:48:53 2022
tree 9636448889f6b9d19c0153e7c005506cedcb07fb
parent bdb63397ec033992bff4f7eadb1597789d6a8f3d

cros_next: add system textfield component

This cl creates a system textfield component with material design.
The changes are summarized below:
- Add a SystemTextfield class extending views::Textfield. Comparing
with views::Textfield, SystemTextfield has specific small, medium,
and large sizes and applies dynamic colors.

- Add a SystemTextfieldController class extending
views::TextfieldController. It defines unified system UI textfield
behaviors:
    1. When the textfield just gets focused with Tab key, it will
    not be activated until the user presses RETURN.
    2. Clicking the textfield will both focus and activate the
    textfield. Single clicking will highlight all the text.
    3. While editing the textfield, pressing RETURN will commit
    the changes and deactivate the textfield but keep focus.
    4. While editing the textfield, pressing ESCAPE will discard
    the changes and deactivate the textfield but keep focus.
    5. The focus ring would only show on activated.

Corresponding unit test will be added in the following cl.

Bug: b/252362180
Change-Id: I8b9b7349a4617b88d225f5272d5b2891c7a9d4ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4054274
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Xiaodan Zhu <zxdan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1086473}