Automatically grow D3DRenderTargetView heap as needed.

Change-Id: I55cf2daa48ec694fc9e1939e270f55dd7a3162a7
Bug: skia:9935
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/287619
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
7 files changed