Add tablet tab strip bg 9-patches for dark theme

Bug: 1121402
Change-Id: Ia47af8941c19e531837f676664432cb4faf5d7b3
Binary-Size: Adds 9-patches needed for dark theme on tablets
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406840
Commit-Queue: Sinan Sahin <sinansahin@google.com>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807067}

chrome/android/chrome_java_resources.gni

@@ -149,6 +149,7 @@ chrome_java_resources = [
   "java/res/drawable-ldrtl-mdpi-v17/btn_toolbar_reload.png",
   "java/res/drawable-ldrtl-mdpi-v17/ic_share_white_24dp.png",
   "java/res/drawable-ldrtl-mdpi-v17/ic_suggestion_magnifier.png",
+  "java/res/drawable-ldrtl-sw600dp-night-xhdpi/toolbar_background.9.png",
   "java/res/drawable-ldrtl-sw600dp-xhdpi-v17/toolbar_background.9.png",
   "java/res/drawable-ldrtl-v17/btn_back.xml",
   "java/res/drawable-ldrtl-v17/btn_forward.xml",
@@ -289,6 +290,7 @@ chrome_java_resources = [
   "java/res/drawable-nodpi/widget_preview.png",
   "java/res/drawable-sw600dp-hdpi/google_logo.png",
   "java/res/drawable-sw600dp-mdpi/google_logo.png",
+  "java/res/drawable-sw600dp-night-xhdpi/toolbar_background.9.png",
   "java/res/drawable-sw600dp-xhdpi/google_logo.png",
   "java/res/drawable-sw600dp-xhdpi/toolbar_background.9.png",
   "java/res/drawable-sw600dp-xxhdpi/google_logo.png",

chrome/android/java/res/layout/toolbar_tablet.xml

@@ -14,7 +14,7 @@
     android:layout_width="match_parent"
     android:layout_height="@dimen/toolbar_height_no_shadow"
     android:layout_marginTop="@dimen/tab_strip_height"
-    android:background="@color/default_bg_color"
+    android:background="@color/toolbar_background_primary"
     android:paddingStart="@dimen/tablet_toolbar_start_padding" >
 
     <LinearLayout