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
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index cf830c7..d54e3a1 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -286,4 +286,8 @@
     <!-- Size of the maximum radius for the enforced rounded rectangles. -->
     <dimen name="enforced_rounded_corner_max_radius">16dp</dimen>
 
+<!-- Overview placeholder to compile in Launcer3 without Quickstep -->
+    <dimen name="task_thumbnail_icon_size">0dp</dimen>
+    <dimen name="overview_task_margin">0dp</dimen>
+
 </resources>