[Modern] Extend background color on omnibox suggestions

Bug: 814902
Change-Id: Ice5da70720f398c1ade0396e10f5990ee043c505
Reviewed-on: https://chromium-review.googlesource.com/999164Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548848}

chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarLayout.java

@@ -560,8 +560,10 @@ public class LocationBarLayout
             int availableViewportHeight =
                     Math.min(mTempRect.height(), decorHeight) + additionalHeightForBottomNavMenu;
             int availableListHeight = availableViewportHeight - anchorBottomRelativeToContent;
-            // If the bottom sheet is used, the suggestions should consume all available space.
-            int desiredHeight = Math.min(availableListHeight, getIdealHeight());
+            // The suggestions should consume all available space in Modern on phone.
+            int desiredHeight = useModernDesign() && !mIsTablet
+                    ? availableListHeight
+                    : Math.min(availableListHeight, getIdealHeight());
             if (layoutParams.height != desiredHeight) {
                 layoutParams.height = desiredHeight;
                 updateLayout = true;