Revert "Delete getRenderTargetHandle call on SkSurface."

This reverts commit c828109ebd1519134b1c3fa168519ac07a31fe05.

Reason for revert: Need to fix flutter

Original change's description:
> Delete getRenderTargetHandle call on SkSurface.
> 
> All clients and internal code should be switched (once changes land soon)
> to the new getBackendRenderTarget call instead.
> 
> Bug: skia:
> Change-Id: I6f490b6d26a72f37f97216be04e541483206510d
> Reviewed-on: https://skia-review.googlesource.com/121103
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Greg Daniel <egdaniel@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: skia:
Change-Id: I571298f839757fcdedcd8117519e740ac7ef1344
Reviewed-on: https://skia-review.googlesource.com/121480
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

2 files changed, 11 insertions, 0 deletions

diff --git a/src/gpu/mtl/GrMtlRenderTarget.h b/src/gpu/mtl/GrMtlRenderTarget.h
index c0f0cf57e1..c653952482 100644
--- a/src/gpu/mtl/GrMtlRenderTarget.h
+++ b/src/gpu/mtl/GrMtlRenderTarget.h
@@ -40,6 +40,10 @@ public:
         return true;
     }
 
+#ifdef SK_SUPPORT_LEGACY_BACKEND_OBJECTS
+    GrBackendObject getRenderTargetHandle() const override;
+#endif
+
     GrBackendRenderTarget getBackendRenderTarget() const override {
         return GrBackendRenderTarget(); // invalid
     }
diff --git a/src/gpu/mtl/GrMtlRenderTarget.mm b/src/gpu/mtl/GrMtlRenderTarget.mm
index c102e6dcfc..c8060cf88c 100644
--- a/src/gpu/mtl/GrMtlRenderTarget.mm
+++ b/src/gpu/mtl/GrMtlRenderTarget.mm
@@ -63,6 +63,13 @@ GrMtlGpu* GrMtlRenderTarget::getMtlGpu() const {
     return static_cast<GrMtlGpu*>(this->getGpu());
 }
 
+#ifdef SK_SUPPORT_LEGACY_BACKEND_OBJECTS
+GrBackendObject GrMtlRenderTarget::getRenderTargetHandle() const {
+    void* voidRT = (__bridge_retained void*)fRenderTexture;
+    return (GrBackendObject)voidRT;
+}
+#endif
+
 void GrMtlRenderTarget::onAbandon() {
     fRenderTexture = nil;
     fResolveTexture = nil;