Increase CCT bottom bar max height

Increase the maximum limit of CCT bottom bar height to display larger
view.

Bug: None
Change-Id: I0b0a8831cbd39f299e0dafd8e0eb314e8fe9b398
Reviewed-on: https://chromium-review.googlesource.com/702687Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Lei Tian <ltian@google.com>
Cr-Commit-Position: refs/heads/master@{#506816}

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

@@ -393,7 +393,7 @@
     <dimen name="min_toolbar_icon_side_padding">6dp</dimen>
     <dimen name="custom_tabs_url_text_size">12sp</dimen>
     <dimen name="custom_tabs_title_text_size">16sp</dimen>
-    <dimen name="custom_tabs_bottom_bar_max_height">60dp</dimen>
+    <dimen name="custom_tabs_bottom_bar_max_height">120dp</dimen>
     <dimen name="custom_tabs_screenshot_height">300dp</dimen>
     <dimen name="custom_tabs_screenshot_width">190dp</dimen>