Skip SkBitmapProvider instantiation in SkImageShader::onContextSize

src/image/SkImageShader.cpp

Index: src/image/SkImageShader.cpp
diff --git a/src/image/SkImageShader.cpp b/src/image/SkImageShader.cpp
index 8407f10086999227cd22d1e953074745de739e4a..a1882ab6654125161235cb81f043926b664b9513 100644
--- a/src/image/SkImageShader.cpp
+++ b/src/image/SkImageShader.cpp
@@ -46,7 +46,7 @@ bool SkImageShader::isOpaque() const {
 }
 
 size_t SkImageShader::onContextSize(const ContextRec& rec) const {
-    return SkBitmapProcLegacyShader::ContextSize(rec, SkBitmapProvider(fImage.get()).info());
+    return SkBitmapProcLegacyShader::ContextSize(rec, as_IB(fImage)->onImageInfo());
 }
 
 SkShader::Context* SkImageShader::onCreateContext(const ContextRec& rec, void* storage) const {