Fine tune Caption size and style preview height for tablet

Root cause: We introduce the material design illustration in Android S. The most of illustration preview height is 300dp, but the SubTitleView preview keep 200dp in the phone and 150dp in tablet. The value is defined in 2017.
Solution: Align material design illustration height which looks a lot closer to an actual video, without pushing too much content below the screen.

Bug: 227264630
Test: Manual testing
Change-Id: I1a9040f50dfb6fb95c1cadbe4e7e4d24ff8ab058
diff --git a/res/values-land/dimens.xml b/res/values-land/dimens.xml
index 37e71e2..5248da6 100755
--- a/res/values-land/dimens.xml
+++ b/res/values-land/dimens.xml
@@ -18,8 +18,6 @@
     <dimen name="appwidget_width">421dip</dimen>
     <dimen name="appwidget_height">68dip</dimen>
 
-    <dimen name="captioning_preview_height">100dp</dimen>
-
     <!-- ActionBar height -->
     <dimen name="actionbar_size">46dip</dimen>
 
diff --git a/res/values-sw600dp-land/dimens.xml b/res/values-sw600dp-land/dimens.xml
index 4e4a1d3..015a6af 100755
--- a/res/values-sw600dp-land/dimens.xml
+++ b/res/values-sw600dp-land/dimens.xml
@@ -19,8 +19,6 @@
     <dimen name="screen_margin_top">72dip</dimen>
     <dimen name="screen_margin_bottom">48dip</dimen>
 
-    <dimen name="captioning_preview_height">150dp</dimen>
-
     <dimen name="confirm_credentials_top_padding">20dp</dimen>
     <dimen name="confirm_credentials_top_margin">24dp</dimen>
 
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index b67bb22..c80e42c 100755
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -49,7 +49,7 @@
     <dimen name="pager_tabs_title_padding">16dp</dimen>
     <dimen name="pager_tabs_selected_indicator_height">3dp</dimen>
 
-    <dimen name="captioning_preview_height">200dp</dimen>
+    <dimen name="captioning_preview_height">300dp</dimen>
 
     <dimen name="autoclick_preview_height">200dp</dimen>