Merge "Skip drawing snapshot if we can't create the buffer." into oc-mr1-dev

am: 44e1d4eb3c

Change-Id: Ia7e02905e030a1b3ef3841e5b77d49006b764b0f

services/core/java/com/android/server/wm/TaskSnapshotController.java

@@ -296,7 +296,9 @@ class TaskSnapshotController {
         decorPainter.drawDecors(c, null /* statusBarExcludeFrame */);
         node.end(c);
         final Bitmap hwBitmap = ThreadedRenderer.createHardwareBitmap(node, width, height);
-
+        if (hwBitmap == null) {
+            return null;
+        }
         return new TaskSnapshot(hwBitmap.createGraphicBufferHandle(),
                 topChild.getConfiguration().orientation, mainWindow.mStableInsets,
                 ActivityManager.isLowRamDeviceStatic() /* reduced */, 1.0f /* scale */);