SkPDF: PDFShader does not hold images/bitmaps

src/pdf/SkPDFShader.cpp

Index: src/pdf/SkPDFShader.cpp
diff --git a/src/pdf/SkPDFShader.cpp b/src/pdf/SkPDFShader.cpp
index 5dd94e2c68138317b90527b0642aece103d158ac..abcae7be12c33010a4ccfadb06acb4c335ef4596 100644
--- a/src/pdf/SkPDFShader.cpp
+++ b/src/pdf/SkPDFShader.cpp
@@ -452,7 +452,9 @@ private:
 ////////////////////////////////////////////////////////////////////////////////
 
 SkPDFFunctionShader::SkPDFFunctionShader(SkPDFShader::State* state)
-    : SkPDFDict("Pattern"), fShaderState(state) {}
+    : SkPDFDict("Pattern"), fShaderState(state) {
+    state->fImage.reset();
+}
 
 SkPDFFunctionShader::~SkPDFFunctionShader() {}
 
@@ -463,7 +465,9 @@ bool SkPDFFunctionShader::equals(const SkPDFShader::State& state) const {
 ////////////////////////////////////////////////////////////////////////////////
 
 SkPDFAlphaFunctionShader::SkPDFAlphaFunctionShader(SkPDFShader::State* state)
-    : fShaderState(state) {}
+    : fShaderState(state) {
+    state->fImage.reset();
+}
 
 bool SkPDFAlphaFunctionShader::equals(const SkPDFShader::State& state) const {
     return state == *fShaderState;
@@ -474,7 +478,9 @@ SkPDFAlphaFunctionShader::~SkPDFAlphaFunctionShader() {}
 ////////////////////////////////////////////////////////////////////////////////
 
 SkPDFImageShader::SkPDFImageShader(SkPDFShader::State* state)
-    : fShaderState(state) {}
+    : fShaderState(state) {
+    state->fImage.reset();
+}
 
 bool SkPDFImageShader::equals(const SkPDFShader::State& state) const {
     return state == *fShaderState;