Add border spacing and fixed cell height to grid.

- Border spacing is the spacing between the cells.
- Workspace cell height is now fixed, and we allocate
  all the "extra" space to three different variable height
  areas.

* Built behind ENABLE_FOUR_COLUMNS flag because it hinders the
default grid.

Bug: 175329686
Test: - set border spacing to 0 and confirm matches prior layout
      - test drag and drop still worked
      - test reordering
      - test widgets
      - test folders
      - test multiwindow

Change-Id: Ic6f3dff577d28ff214bda4b0a787ec7fd08c108b
diff --git a/src/com/android/launcher3/BubbleTextView.java b/src/com/android/launcher3/BubbleTextView.java
index 21297c9..b05a13a 100644
--- a/src/com/android/launcher3/BubbleTextView.java
+++ b/src/com/android/launcher3/BubbleTextView.java
@@ -17,6 +17,7 @@
 package com.android.launcher3;
 
 import static com.android.launcher3.FastBitmapDrawable.newIcon;
+import static com.android.launcher3.config.FeatureFlags.ENABLE_FOUR_COLUMNS;
 import static com.android.launcher3.graphics.IconShape.getShape;
 import static com.android.launcher3.graphics.PreloadIconDrawable.newPendingIcon;
 import static com.android.launcher3.icons.GraphicsUtils.setColorAlphaBound;
@@ -198,6 +199,7 @@
             setTextSize(TypedValue.COMPLEX_UNIT_PX, grid.iconTextSizePx);
             setCompoundDrawablePadding(grid.iconDrawablePaddingPx);
             defaultIconSize = grid.iconSizePx;
+            setCenterVertically(ENABLE_FOUR_COLUMNS.get());
         } else if (mDisplay == DISPLAY_ALL_APPS) {
             setTextSize(TypedValue.COMPLEX_UNIT_PX, grid.allAppsIconTextSizePx);
             setCompoundDrawablePadding(grid.allAppsIconDrawablePaddingPx);
@@ -232,7 +234,6 @@
         int shadowSize = context.getResources().getDimensionPixelSize(
                 R.dimen.blur_size_click_shadow);
         mHighlightShadowFilter = new BlurMaskFilter(shadowSize, BlurMaskFilter.Blur.INNER);
-
     }
 
     @Override
@@ -554,6 +555,14 @@
         outBounds.set(left, top, right, bottom);
     }
 
+
+    /**
+     * Sets whether to vertically center the content.
+     */
+    public void setCenterVertically(boolean centerVertically) {
+        mCenterVertically = centerVertically;
+    }
+
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         if (mCenterVertically) {