key event focus logic should support large tablets

TL;DR;; On smaller tablets, landscape = vertical hotseat bar, and
portrait = horizontal hotseat bar. However, in larger tablets, hotseat bar is
always horizontal. This is now correctly handled using DeviceProfile.isVerticalBar
method.

b/19732584

Change-Id: I1035c89b4685be12dbc863f8a1465047a5fec6a6

src/com/android/launcher3/DeviceProfile.java

@@ -81,6 +81,7 @@ public class DeviceProfile {
     boolean isTablet;
     boolean isLargeTablet;
     boolean isLayoutRtl;
+
     boolean transposeLayoutWithOrientation;
 
     int desiredWorkspaceLeftRightMarginPx;
@@ -699,6 +700,10 @@ public class DeviceProfile {
         return isLargeTablet;
     }
 
+    /**
+     * When {@code true}, hotseat is on the bottom row when in landscape mode.
+     * If {@code false}, hotseat is on the right column when in landscape mode.
+     */
     boolean isVerticalBarLayout() {
         return isLandscape && transposeLayoutWithOrientation;
     }