Overview - Adds first pass at making landscape layout real.

Adds dynamic sizing to margins around task view, also creates space in the
overview actions view in landscape to make space for the proactive chips if
needed.

Bug: 182529089
Test: Local build and run on two devices
Change-Id: I447de3564a3249ede4e8e8a4d3e5d1c177f6be61

src/com/android/launcher3/DeviceProfile.java

@@ -151,6 +151,10 @@ public class DeviceProfile {
     public int allAppsIconDrawablePaddingPx;
     public float allAppsIconTextSizePx;
 
+    // Overview
+    public int overviewTaskThumbnailTopMarginPx;
+    public int overviewTaskMarginPx;
+
     // Widgets
     public final PointF appWidgetScale = new PointF(1.0f, 1.0f);
 
@@ -297,6 +301,11 @@ public class DeviceProfile {
                 : (hotseatBarTopPaddingPx + hotseatBarBottomPaddingPx
                         + (isScalableGrid ? 0 : hotseatExtraVerticalSize)));
 
+
+        overviewTaskMarginPx = res.getDimensionPixelSize(R.dimen.overview_task_margin);
+        overviewTaskThumbnailTopMarginPx = res.getDimensionPixelSize(
+                R.dimen.task_thumbnail_icon_size) + 2 * overviewTaskMarginPx;
+
         // Calculate all of the remaining variables.
         extraSpace = updateAvailableDimensions(res);
         // Now that we have all of the variables calculated, we can tune certain sizes.