Handle config changes in Launcher

- This is practically a revert to http://ag/c/13687966/5 and refactored to use DisplayController.DisplayInfoChangeListener
- Make Launcher handle size and density change so transition is less janky when screen size changes
- Added fix in RecentsView to update state and TaskView when display profile changes
- Removed 720dp specific resoureces
- Removed unused widget_section_indent
- Removed unnecessary all_apps_background_canvas 600dp override that is not needed in AllApps+
- Moved remaining dp specific into DeviceProfile
- Simplified allowRotation logic to use single variable in DeviceProfile to determine if allow rotation is enabled by default

Fixes: 180803696
Test: manual
Change-Id: Iea0a7d1a0e14dc3613152dd3b3887450a2e1fc2f

src/com/android/launcher3/ButtonDropTarget.java

@@ -74,7 +74,6 @@ public abstract class ButtonDropTarget extends TextView
 
     protected final Launcher mLauncher;
 
-    private int mBottomDragPadding;
     protected DropTargetBar mDropTargetBar;
 
     /** Whether this drop target is active for the current drag */
@@ -103,7 +102,6 @@ public abstract class ButtonDropTarget extends TextView
         mLauncher = Launcher.getLauncher(context);
 
         Resources resources = getResources();
-        mBottomDragPadding = resources.getDimensionPixelSize(R.dimen.drop_target_drag_padding);
         mDragDistanceThreshold = resources.getDimensionPixelSize(R.dimen.drag_distanceThreshold);
     }
 
@@ -276,7 +274,7 @@ public abstract class ButtonDropTarget extends TextView
     @Override
     public void getHitRectRelativeToDragLayer(android.graphics.Rect outRect) {
         super.getHitRect(outRect);
-        outRect.bottom += mBottomDragPadding;
+        outRect.bottom += mLauncher.getDeviceProfile().dropTargetDragPaddingPx;
 
         sTempCords[0] = sTempCords[1] = 0;
         mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, sTempCords);