Add support for injecting events into ActivityContainers. (DO NOT MERGE)

Modified ActivityView to inject touch events it receives back into
its activity container.  The container then injects the event into
the input system along with the display id of the underlying virtual
display.

Enhanced the input system to support concurrent dispatch of touch
events on multiple displays which is required for this to work.

Change-Id: I9cf1870db3be6f99a52ed9a1e3ceafe42c940093
diff --git a/core/java/android/app/ActivityView.java b/core/java/android/app/ActivityView.java
index 8acd19b..48ec420 100644
--- a/core/java/android/app/ActivityView.java
+++ b/core/java/android/app/ActivityView.java
@@ -27,6 +27,9 @@
 import android.util.AttributeSet;
 import android.util.DisplayMetrics;
 import android.util.Log;
+import android.view.InputDevice;
+import android.view.InputEvent;
+import android.view.MotionEvent;
 import android.view.Surface;
 import android.view.TextureView;
 import android.view.TextureView.SurfaceTextureListener;
@@ -112,6 +115,29 @@
         }
     }
 
+    private boolean injectInputEvent(InputEvent event) {
+        try {
+            return mActivityContainer != null && mActivityContainer.injectEvent(event);
+        } catch (RemoteException e) {
+            return false;
+        }
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        return injectInputEvent(event) || super.onTouchEvent(event);
+    }
+
+    @Override
+    public boolean onGenericMotionEvent(MotionEvent event) {
+        if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) {
+            if (injectInputEvent(event)) {
+                return true;
+            }
+        }
+        return super.onGenericMotionEvent(event);
+    }
+
     public boolean isAttachedToDisplay() {
         return mSurface != null;
     }