Update display contents when metrics change

There are two separate overrides for display metrics in DisplayManager
and WindowManager:
- In DM - LogicalDisplay#mOverrideDisplayInfo, in most cases not null.
- In WM - DisplayContent#mBaseDisplayWidth/Height/Density, different
from #mInitialDisplayWidth/Height/Density values when some metrics are
forced.

When display was resized its windows weren't updated because of
two problems: old LogicaDisplay#mOverrideDisplayInfo was preventing
WM from detecting the change and override (base) display metrics were
never updated by resize.

When display size changes:
- Before this CL:
DM receives DISPLAY_CHANGED event, it updates internal values.
In most cases there is an override obtained from WM and WM doesn't
get new values from LogicalDisplay#getDisplayInfoLocked().

- With this CL:
DM receives DISPLAY_CHANGED event, it updates internal values and
resets the override received from WM. WM will receive updated values
and will decide whether to apply them or not: if there is no override
in WM - it will apply values from WM, otherwise it will keep the
override. In both cases WM will eventually update its own override
and will update the override in DM.

Bug: 35258051
Bug: 34164473
Test: android.server.cts.ActivityManagerDisplayTests
Test: #testDisplayResize
Test: #testForceDisplayMetrics
Change-Id: I80795434a6a35adb0577fbce334d76fabd2fa03d

core/java/android/view/Display.java

@@ -50,7 +50,7 @@ import java.util.Arrays;
  * <li>The real display area specifies the part of the display that contains content
  * including the system decorations.  Even so, the real display area may be smaller than the
  * physical size of the display if the window manager is emulating a smaller display
- * using (adb shell am display-size).  Use the following methods to query the
+ * using (adb shell wm size).  Use the following methods to query the
  * real display area: {@link #getRealSize}, {@link #getRealMetrics}.</li>
  * </ul>
  * </p><p>
@@ -947,7 +947,7 @@ public final class Display {
      * The size is adjusted based on the current rotation of the display.
      * </p><p>
      * The real size may be smaller than the physical size of the screen when the
-     * window manager is emulating a smaller display (using adb shell am display-size).
+     * window manager is emulating a smaller display (using adb shell wm size).
      * </p>
      *
      * @param outSize Set to the real size of the display.