Remove unused 'offset' parameter from peekDstTexture.

The dest-texture uniforms are being set directly inside GrPipeline now;
our callers don't have any other reason to inspect the offset.

Change-Id: I319287cc26767a4ea294da6615e83168500b318f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/415876
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/GrPipeline.cpp b/src/gpu/GrPipeline.cpp
index 4b2dfdf..115de1e 100644
--- a/src/gpu/GrPipeline.cpp
+++ b/src/gpu/GrPipeline.cpp
@@ -137,8 +137,7 @@
 
 void GrPipeline::setDstTextureUniforms(const GrGLSLProgramDataManager& pdm,
                                        GrGLSLBuiltinUniformHandles* fBuiltinUniformHandles) const {
-    SkIPoint offset;
-    GrTexture* dstTexture = this->peekDstTexture(&offset);
+    GrTexture* dstTexture = this->peekDstTexture();
 
     if (dstTexture) {
         if (fBuiltinUniformHandles->fDstTextureCoordsUni.isValid()) {