[Overlay][TTS] Adjust Bar height in new layout.

This CL just makes the Overlay Panel Bar height larger by updating
a resource the contains the height dimension in DPs.

BUG=1013333

Change-Id: I863d76ea2021ac48d52c3be212bdc34604d9f633
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854206Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Donn Denman <donnd@chromium.org>
Auto-Submit: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704842}

chrome/android/java/res/values/dimens.xml

@@ -135,7 +135,7 @@
 
     <!-- Overlay panel dimensions -->
     <dimen name="overlay_panel_bar_height_legacy">56dp</dimen>
-    <dimen name="overlay_panel_bar_height">60dp</dimen>
+    <dimen name="overlay_panel_bar_height">70dp</dimen>
     <dimen name="preview_tab_favicon_size">24dp</dimen>
 
     <!-- Autofill keyboard accessory dimensions -->