Add minimal width and height logging to AM dump.

Currently this is used in CTS to validate task and stack bounds.

Bug: 27785974
Change-Id: I2dcf6d51dba5d1bf15037d333ff41dea8f5db1d3

services/core/java/com/android/server/am/ActivityStack.java

@@ -4783,6 +4783,8 @@ final class ActivityStack {
                     "    Task id #" + task.taskId + "\n" +
                     "    mFullscreen=" + task.mFullscreen + "\n" +
                     "    mBounds=" + task.mBounds + "\n" +
+                    "    mMinimalWidth=" + task.mMinimalWidth + "\n" +
+                    "    mMinimalHeight=" + task.mMinimalHeight + "\n" +
                     "    mLastNonFullscreenBounds=" + task.mLastNonFullscreenBounds);
             if (printed) {
                 header = null;