Fix UMR (valgrind) bug in GrDrawingManager
Fix UMR (valgrind) bug in GrDrawingManager

Even prior to https://skia-review.googlesource.com/c/skia/+/332600
(Change UnrefDDLTask to just be the DDLTask) there was no good reason
the 'fRenderTask' array and the 'idArray' kept a strict 1-1
correspondence.

Change-Id: Ib92b47b724c319f52fff459d3dc28c49c17bd045
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/333576
Reviewed-by: Julia Lavrova <66a91ddff0a66e6df510780220f7ed6687af5ca5@google.com>
Reviewed-by: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>
Commit-Queue: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>

aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia