The UX rework will fix that: consistent style with Omnibar and in-product help will emphasize that this is part of Chrome.
This won't happen before 72/73 and a "fix" like a string or a logo wasn't deemed appropriate.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a562f181201b1650f282144256c4894135457be7

commit a562f181201b1650f282144256c4894135457be7
Author: Friedrich Horschig <fhorschig@chromium.org>
Date: Mon Nov 19 10:36:02 2018

[Mfill Android] Apply v2 style on keyboard accessory

This CL introduces the new style of the keyboard accessory (clean white)
to highlight is as part of the Chrome UI. It's also the base for IPH
which will explicitly state the origin of suggestions and actions.

Because the new design uses autofill suggestions as integral part, it is
guarded by the #autofill-keyboard-accessory-view flag which isn't used
in other way anymore.

To keep the old implementation until the new design is fully approved
and fleshed out, the KeyboardAccessoryModernView* classes extend the
existing classes and replace them if the appropriate flags are set.

For screenshots highlighting the differences, see:
go/keyboard-accessory-v2

Bug: 853772,  876750 
Change-Id: I44718a4e2269d17b002d7dc890784a847ed840e7
Reviewed-on: https://chromium-review.googlesource.com/c/1338087
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Friedrich Horschig [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609230}
[add] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/res/drawable/ic_keyboard.xml
[add] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/res/layout/keyboard_accessory_modern.xml
[add] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/res/layout/keyboard_accessory_suggestion.xml
[add] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/res/layout/keyboard_accessory_tabs.xml
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryCoordinator.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryMediator.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryMetricsRecorder.java
[add] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryModernView.java
[add] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryModernViewBinder.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryProperties.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryView.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryViewBinder.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/ManualFillingCoordinator.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/java_sources.gni
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/javatests/src/org/chromium/chrome/browser/autofill/keyboard_accessory/ManualFillingIntegrationTest.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/junit/src/org/chromium/chrome/browser/autofill/keyboard_accessory/KeyboardAccessoryControllerTest.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/android/junit/src/org/chromium/chrome/browser/autofill/keyboard_accessory/ManualFillingControllerTest.java
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/browser/about_flags.cc
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/browser/android/chrome_feature_list.cc
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/chrome/browser/password_manager/password_accessory_metrics_util.h
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/components/autofill/core/common/autofill_features.cc
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/components/autofill/core/common/autofill_features.h
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/components/autofill/core/common/autofill_util.cc
[modify] https://crrev.com/a562f181201b1650f282144256c4894135457be7/components/autofill/core/common/autofill_util.h

(This is planned to be fixed with the white design + FRE)