Update widget manipulation colors.

Spec:
* Resize frame: https://docs.google.com/presentation/d/1UxdDh8EFhPbdRWRwzjbpgL-j02ew4Ew3eG3XBCeoYdo/edit#slide=id.OeO4S0j
* Drop target bar: https://docs.google.com/presentation/d/1UxdDh8EFhPbdRWRwzjbpgL-j02ew4Ew3eG3XBCeoYdo/edit#slide=id.vXfwHn8

Test: manual
Bug: 187910396
Change-Id: I6fd433796970c428841ee96e45ee4fca1ded3665
Merged-In: I6fd433796970c428841ee96e45ee4fca1ded3665
diff --git a/src/com/android/launcher3/CellLayout.java b/src/com/android/launcher3/CellLayout.java
index bfa1769..550a399 100644
--- a/src/com/android/launcher3/CellLayout.java
+++ b/src/com/android/launcher3/CellLayout.java
@@ -263,7 +263,7 @@
         mBackground.setCallback(this);
         mBackground.setAlpha(0);
 
-        mGridColor = Themes.getAttrColor(getContext(), R.attr.gridColor);
+        mGridColor = Themes.getAttrColor(getContext(), R.attr.workspaceAccentColor);
         mGridVisualizationPadding =
                 res.getDimensionPixelSize(R.dimen.grid_visualization_cell_spacing);
         mGridVisualizationRoundingRadius =