More SkISizification in GPU code.

Uses SkISize instead of separate width/height variables in many places.

No functional change.

Change-Id: If87b2c57e43d810f0820c4e3c9ef8e6b8ebd10ba
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/249886
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrTextureRenderTargetProxy.cpp b/src/gpu/GrTextureRenderTargetProxy.cpp
index ae70c0f..0c1a2cc 100644
--- a/src/gpu/GrTextureRenderTargetProxy.cpp
+++ b/src/gpu/GrTextureRenderTargetProxy.cpp
@@ -114,7 +114,7 @@
     }
 
     // TODO: do we have enough information to improve this worst case estimate?
-    return GrSurface::ComputeSize(caps, this->backendFormat(), this->width(), this->height(),
+    return GrSurface::ComputeSize(caps, this->backendFormat(), this->dimensions(),
                                   colorSamplesPerPixel, this->proxyMipMapped(),
                                   !this->priv().isExact());
 }