Add new command line option to change global screen size.

For example:

adb shell am display-size 1024x600

Change-Id: I5df462acd3323bdaaaefa3126faea7dd8595b726
diff --git a/core/java/android/view/IWindowManager.aidl b/core/java/android/view/IWindowManager.aidl
index 0be02a6..adafb59 100644
--- a/core/java/android/view/IWindowManager.aidl
+++ b/core/java/android/view/IWindowManager.aidl
@@ -56,6 +56,9 @@
     void getDisplaySize(out Point size);
     int getMaximumSizeDimension();
 
+    void setForcedDisplaySize(int longDimen, int shortDimen);
+    void clearForcedDisplaySize();
+
     // These can only be called when injecting events to your own window,
     // or by holding the INJECT_EVENTS permission.  These methods may block
     // until pending input events are finished being dispatched even when 'sync' is false.